Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abfe5c4704c5fc4…

MALICIOUS

PDF

96.8 KB Created: 2021-09-07 11:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 200af60847384b72cd7402166caf6088 SHA-1: b37d5526eae5d32f3a5adb0fd2c1a531d5318072 SHA-256: 1abfe5c4704c5fc4c48c6049b9449f3dfb8c26c82b94763d8e20778b28b04177
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455a726985---86216178942.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b52235c25c---96420304962.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/plq9966rv8blo1o9cot66bmri2/falinevikesufoziv.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/dolivapanuzu.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/15597603679.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2qqcd9ukr7574p57ok8fq9a8m3/kofovutoferijawumuwoke.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/33053693587.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/degilegaxasofopivuxelopub.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c952f8d46f---kugavupizebupamajeruber.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1311f4d4df7149e8ccc3280a77d83866/xoxalivedopev.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/58987229545.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/30969827262.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9aqega9jn5bfi7r4vo582cbtp9/zelotuvi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8qu9ag94r4savsosgug80vvql4/54744887172.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/32a7a5d6c0575f3c8c9051499710e045/vawamijirigopagiw.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nagiba.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612175ce6057d---ritikobajazutotuten.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef1e48756---59706212244.pdfIn PDF document text
    • http://elitvorota.ru/f/file/65019927815.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/elumsihu8rocagfuu5drpckaul/95828040277.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e2eb72e2cdd798bba10aa8deb78a3c0/zipazafibokobusanilenowu.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/a8jmm1qtj7g4b303jb5j0dot6n/bibefokizuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=superantispyware+download+update+manuallyPDF 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_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 21348 bytes
SHA-256: 15cf14cb8d64e3b44ab47b4df57897c9332d4a1822b7f8523987b120c6bd36d9
font_01_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 10928 bytes
SHA-256: 51929a327d3b4cf7d488a2b223ee4e271c4beaa2c2afa43bf03440603566961b
font_02_sfnt_off00015d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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