Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a064d111abc7e44…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 13:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 455c7f2b871aa52d12e9f1faf7efd2ad SHA-1: 43a401043833f619772e5811264175aa1c67aa07 SHA-256: 3a064d111abc7e444de0bb64943ba6a4445b2e8d6b680f9602c75802d758a593
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute further malicious content. The presence of a PDF_RANDOM_URL_LINK heuristic and ML_NYX_PDF_MALICIOUS classification strongly indicates malicious intent. The document body is heavily obfuscated, but the heuristics and URLs point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=history+of+the+bible+pdf+free+download PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mnoh7fsjhh6pjso1fhc003rea4/kijopuri.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xitegadif.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/83000483801.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7ab40a3eb---wulidegasuzen.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/tiwilunudetasejarugunezin.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/18758924978.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/mubodujexi.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/46122052450.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd5867c80---zavawexifusanitomawapufaf.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/nonosag.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/58160061288.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0ee53b6cdc7df8cc2fb24420677536cb/lomagapekuremikojubus.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/40cb72a8474d98eee5a69ad34d6f3a15/40974021807.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0ad1510d9c7718f7a36f23dd9bdb29f6/sekegivubub.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/097e9d31491046995a589944d484b06f/xatumenotovapidetukibe.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/magosaluxanus.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d82bca18d---50901791141.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30f8b3a9e---ladisus.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/38376220518.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/27544754204.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab08902e83---pomisubotetavuvekax.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/55826514349.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6647a071c9cfd371d2e12359a3427544/parezikilegusobodig.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a243ec6a---84984670396.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/28a9f45420a9cdb9b7715090fdfc6b69/rubozusozov.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/umqk1jgmv94261hfbjlpeve2u1/69806700668.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/n097aseko9j72qujo0l1lsl2c5/16635926428.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/sudatakedoweje.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 18156 bytes
SHA-256: 459c655be3e135af5d02438c0b1f0c58dcaa4558775e6f1b491ef711a1f1debc
font_01_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 10924 bytes
SHA-256: 7373d3d38a374c3550af1beac9a690c14818950df31962f9c92de4c43fc54b82

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