Malicious PDF — malware analysis report

Static analysis result for SHA-256 b811aae3d8367196…

MALICIOUS

PDF

77.9 KB Created: 2021-08-25 09:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7f221a93eaa10373a95c2737e17fcb95 SHA-1: 561f8a5884e691257bade20134a8982e2f3febbc SHA-256: b811aae3d8367196d617f8e411200498167184914feec02a9066750bc9757de9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised or disposable hosting domains. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://bmw-zona.ru/uploads/file/zezexozuwir.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3861ccf04db9d2c21e56aee516a2361/51417911432.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f84dcb9552---35827875699.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbaac4bc72---paxunimeluvolugoketad.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8445f58cb847fb26bca27d9dcbcbd329/tunuwigudivasemilid.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/kofurot.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/98832304414.pdfIn PDF document text
    • http://centronegozi.com/public/20663490658.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/67505888374.pdfIn PDF document text
    • https://mobilityservices.it/file/90404925893.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d05e89579---jubefusut.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5f39662d28391fc6eb75aec4abde2350/libexelijatisogazob.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/90262238080.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/zupejatogexuvapasuvu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160828d7ec10f6---kemipirapukubepubovewa.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/63159896970.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/74d8d3320a47dacb38d89414879194e9/53872010690.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/2921173172.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/53682828149.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/36650227870.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d648033db---wuvuxaluxozatepijetajatet.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a4c1c843---datugafoguvos.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210716022201175.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e56a57d1ffea94fe825db639eba9f199/20349306281.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71a42f9c0---27234310919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=two+tailed+z+test+tablePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10288 bytes
SHA-256: f9f9a79b423d5815b636ad0a525bd61047e6c13eeb3354c9bd9c1808ca33f7f4
font_02_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 16704 bytes
SHA-256: 601899ed2eebb370dfa4ce3e75646caa7cad7e464128a77f34526ba4342d6eb9

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