Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b19d5512cc2cd2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 05:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0988d8be977f71aa7fb5f717aaffb809 SHA-1: 527c2a55fbdad04ad1a064e021fcf31b2c5b4795 SHA-256: c8b19d5512cc2cd2ac2e9e44c71ec23477f84a5eb2c0a1505ebfec5469398c00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a common tactic of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://allytemp.ru/uplcv?utm_term=update+browser+android+tablet PDF link annotation
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdfIn PDF document text
    • http://asustainable.com/global/file/noxogigipapakirefaj.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/wuxumojitozatotikofala.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pudubo.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/dinipawixiwozigetaz.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/dakifakojabulepaxemub.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/53963028420.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ail5gglkiu88km7uo42vqbjtnr/80296120049.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/fupozopunobelibikekax.pdfIn PDF document text
    • http://kccmaul.com/files/files/vovumawanesoju.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/liririsezoza.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/kajugipuguvonuxebisapewo.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/terugeluxamefalitiwa.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/64086719223.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/xuxulabuzonegif.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614520243fbdb---wosugujepimiwex.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/lemonoxewobuz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a370d05e---nopanimolu.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/winudukogesedajagup.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/tubefuxibanedobenu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/90656039014.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109030512321959.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034898c7d6---24654806874.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/40075268497.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/28520363056.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 10620 bytes
SHA-256: f017ae46cd59cf74f25b0c6721a032d97e8017064106b907289d68e813077f69
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 16832 bytes
SHA-256: e5bf609c1b91aa418f35bd0e010eec0f7eea56f3b5844658195cf8d17374eacf
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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