Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a72a4bf61d475c…

MALICIOUS

PDF

89.4 KB Created: 2021-07-07 19:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc6ee66e26d360b6ed1aec665750ed87 SHA-1: 320f618ece45be7f5f062fbc23b3ed944c82fad8 SHA-256: 62a72a4bf61d475cb62278c97d41664fe3ee48bdd0f1bbbe2843ee17b54b4fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://homenet-spb.ru/userfiles/file/51395362333.pdf In PDF document text
    • http://konemara.hu/userfiles/file/gemolifazala.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbc9f8bc03---puzekapugomozigalojanolog.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/51531801120.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1ec969a38d620c4d5a95927ffd2b1/16013838562.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/64228616454.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b5f8e6d3e417850003718f105fb7a8de/74680344244.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/jc7uqf7nthlh6i8j7qeahgi5n5/xamaxem.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0f0777e3---bejifafazutewebiv.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/xowipawedodemife.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/765d014701873e1705b46ee45d7005fc/53945341568.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62a0995d---14055150030.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/31525622359.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0bd4f636---25656162549.pdfIn PDF document text
    • http://modern-pro.ru/files/file/68661520745.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/54942800207.pdfIn PDF document text
    • https://avenue102.com/uploads/file/67250260960.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/nokoje.pdfIn PDF document text
    • https://taperagi.com/contents//files/kewimid.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/8693640535.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/14838009290.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210506111837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=average+high+temperature+by+dayPDF 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_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 10800 bytes
SHA-256: 8f4265cfca0ca93e5d1c2fad44fa841c66e3bd8de71650317811e9c8d2d7ef73
font_02_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16776 bytes
SHA-256: 574cec07d88c2f358d1e9d9932eb99567b1165b645d5076720902573a74b3139

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