Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bb858e6adadec0…

MALICIOUS

PDF

101.5 KB Created: 2021-08-14 00:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 212ec895d49c42af7f5731ae33064c7c SHA-1: c7454f1d7c3f147a4a06f116cacf6f3f6582de1c SHA-256: e6bb858e6adadec015b7a45b7eb2ff8558a7aef5ee1de2077f2dc86146f374dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://locktactyuma.com/userfiles/file/13939884440.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7497c7fe7f65334bb9a9eed68fe1bb5b/zukisilibodefodazegulegor.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/51e33c71da0fe9e268c82a7840854535/mapegiluja.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c7b9605d---55560184899.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a83e0ab01daeb620adaa08550211da1b/39625442265.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd016b1d5e---38396261920.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/57154310968.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da59e680a3---50046833093.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076829f07e05---97319245966.pdfIn PDF document text
    • http://www.buildonhope.org/file/kukomipexevafewufimaf.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e88355800---xifojipuleranisosaridep.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f7bedc3c1c532489843029996434d195/vewizumoxexakenirob.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/63e19d40acaa6b0bd7409138d87583b0/72970983101.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/12002989836103fb9190ec2.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5674cc89f---4249096357.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/refirodafabekejeral.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/jewuviwawuxoge.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2f64dc078ef2d2ab3ee487927f29cea1/50885572552.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jizefasozizuwifufufiwigu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ec9f12f6---lunukolotiji.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/98281484163.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/veramekifufufugigituwo.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jalodigesipaxi.pdfIn PDF document text
    • http://specimport.by/files/files/41711056933.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fonam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=semillas+de+minecraft+aldeasPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 17120 bytes
SHA-256: 173e1a4eb94bbd0c454d0b96113fd4fc7f18318df70ecc76d44839f880bb8ec3
font_02_sfnt_off00013f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F33 10592 bytes
SHA-256: ebee0bdad5751c88c62798b3245beadca1215637027233b7725f72cc03fff70e
font_03_sfnt_off0001574b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574B 17968 bytes
SHA-256: ac4979593d5014a1edbe49b99ce955c5e658fc17fe2847cec96b91098394f5d4

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