Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64a0a81b6f62c5f…

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 17:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5794c92f1ecc44ca00596745eb88348 SHA-1: 3572ae1eed67e4e22541f028d948f65e89e6cb40 SHA-256: a64a0a81b6f62c5f1de6d9f7e61a279f61c3ae84657d744856ca162e2fdc2010
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL destinations strongly suggest an attempt to redirect users to malicious content.

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 https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ntlq40hc9nijdu5u73cf6bf006/21822450637.pdf
    • http://akinmedikal.com/uploads/file/31617059083.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf1b59be8---47320283942.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f9d5481c850cf4cadc49aea30756bc11/runigupirep.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1b9fbae613d3785587e2bdcf75ff1378/lisevovubesubujin.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/53f3a787066370ca59415aea2e54d763/83651312713.pdf
    • http://anhbanglaw.com/userfiles/file/80918676828.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/03c4d5d51b3d17ca46ee512d6dd01168/jowofonumenojoda.pdf
    • https://gute-reise.ru/i/files/files/40418386406.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1kmka01pnokq9hq7r9up8htef0/13476628789.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986d3ab1b---duzeb.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ceeb9ab48---vetujugagetodaz.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3b396435ab60f6a4dc60cb6263ac74fb/58977817281.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/779f7aaf0cb00ec8271c05ec0ede1409/79461771810.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4cf511ad---fuzezenubanezowolofugi.pdf
    • http://yangpupark.com/uploadfile/files/rigolu.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab9eed0c8---sogubometokibosava.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/21133623834.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vamfipo99qmg21aa287lb2n1b6/72355899916.pdf
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/62286421853.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/uiqitn9dftnqp6a93hhvj1g424/kosubojaliza.pdf
    • http://vantaibactrungnam.vn/upload/files/pomevovuxususiludolemeli.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bed0f70a38c5b34c66efccfcd27d5f37/44896614875.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hours+to+days+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78a.bin
f2cd696cb53ea28901484c677a4856dab022f04f95baa08980ac8bf3fb1e2057
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10496 bytes
font_01_sfnt_off0000ff9b.bin
6b8a4df0622770a42d143e8589fd0c0827fb09c08dbf3167613b85a25c14c081
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 16872 bytes
font_02_sfnt_off00012b7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 16792 bytes