Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1540e5511cfb7d4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 06:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e52064860f511bd7f4cd1e290e426201 SHA-1: 791e61252d3cc7f8af03a216e4c4d6d460c5f8e5 SHA-256: a1540e5511cfb7d4b5fb4bc16dc38fe8a6b128f010f3bac0294f6afae6c874ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://phrabat.net/UserFiles/File/23500379177.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/phbk5pcctlaftr05om0hr7stp0/lodalerefa.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/scuvb1e6lkhepp6n31metubd1m/71255220315.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/61462367068.pdfIn PDF document text
    • http://promador.pl/userfiles/file/vakuzimewoz.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/retetukanapelu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/rinujogelotivurina.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/jujukowevuzufowu.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/vukadobuzenaz.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/06f67b561a7ffad014ba80d6e808b693/vuditirekawufop.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/72dc87f583efc343879c2e495e5c4a4c/98639930487.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210805/210805112432670130e8hd1hg9l87z.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9bb4fef868de66738c500bb08afede7/7452924831.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/64728273021.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de7399bcfe5---33514953179.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/tuxokewekakadal.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/jd6vdo0ove5olq0qb4nqhm3ub2/94081569288.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/nafetugawuvuj.pdfIn PDF document text
    • http://short-story.ru/upload/file/vefepepawogelivememom.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/nobederirutu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b769fceef94f5773c21be541bd30a60/8774134396.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/lowodesuxigobidototofo.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/93186163487.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/53913751240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bissell+powerwash+proheat+manualPDF 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_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 10756 bytes
SHA-256: 6ddc9a9722b9b34ca59b185c138391dd4a4fcb43352ccc650b4e146654c41813
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 18984 bytes
SHA-256: 1f0f7e1a7b2865f304e9c6f1930b0f61ec1e7fae985f5433562b7628973155d6

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