Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a5bc86fbb4d209…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 07:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba24e4be6e66e905678ae71a877fc9c1 SHA-1: 026523fcdcfd52f851e57e8d7d93d43bfdda4123 SHA-256: b5a5bc86fbb4d20959ed7c8ae8c405bda8a27bbdc2b5162eefd4e47239751750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://medvor.ru/uplcv?utm_term=chat+meaning+in+malayalam PDF link annotation
    • https://cottingham-group.com/cufiles/files/6683810925.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/mejutajawixufanopefuzugod.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77ec67525c002f7a93642b8ce0858dad/83865773100.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c137377af---2109146586.pdfIn PDF document text
    • https://salwangurugram.com/files/dagiworozopemilovukodab.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/00e688fbbeeb607fd876dd07dde65328/xofupo.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/gobojived.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/zexikujo.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/42603631845.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/78068096579.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/39333964760.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5e6f53693a2fce09ef676100cc0c3c75/sotatataterigavawiluwogi.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/pilolim.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa241ec59---48303449428.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad44280d4ec---tifulujofet.pdfIn PDF document text
    • http://pneusmarene.it/images/file/noworad.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/43876411752.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/md21m8u044lbinh1e1nca4035i/42952273489.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/15733703436.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/76373555050.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/sakubupipiro.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be03d5083---62899624023.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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 22444 bytes
SHA-256: 2f55e988f80cac3f9db11f11c8929ff24212f0852a02cb32e5f4661f38f230cb
font_01_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 10312 bytes
SHA-256: 94fd268876a29910b75e84a174210f413479d6acaf43fb645ceb1712843ead78
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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