Malicious PDF — malware analysis report

Static analysis result for SHA-256 010441b21ba84e15…

MALICIOUS

PDF

84.0 KB Created: 2021-08-17 17:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 438a91da4f27f07e199f9c4997313b4c SHA-1: f99804a89ce4b41dcd36df2a798296714248b3f2 SHA-256: 010441b21ba84e15747a97d44dea9c3e8c50da61f20b18c5d821153ea3d773d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a phishing or redirection scheme. ClamAV and ML classifiers strongly indicate malicious intent, likely to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://3q1p.com/upload/file/2107070711131952513nml3cgfzh8e.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jt5ul77qceoh2qvkg86gilt91e/32642758408.pdfIn PDF document text
    • http://wenxuezj.com/images/File/xositofumusirugeloso.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/pazarikopisavudeb.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/54936205934.pdfIn PDF document text
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/xenigidapepodewatazowu.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/53024843802.pdfIn PDF document text
    • https://seikai.jp/free_images/files/mewis.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5bd92eb3e---ronikemiwev.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210814061210.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/488d7e86a51b1321da5d5c644ed9ba04/noxixajesufeganixeberuku.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pagexagagowizujudawiposag.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6445df6d---gepurimimarisozolomej.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/drng920nc1bfkbkk15jrnov5us/walilogerebasabin.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fd211b8e03e155ee57d27409358e3642/99684298441.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/96ee4c9e8bf12f177787cd9a0d21e388/78756204909.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/80994693329.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/vemunubumufeditov.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964fcab27e4---tejema.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e54d820b40e062eecb9f9a5bebf6123e/lelibiwonanaze.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ujakrlsc5stm539tc0s812nean/zudexadiwibamixiwujotepi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac358e973b7---75405511535.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/pobinupalopunafadud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cuphead+2+player+pcPDF 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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 16704 bytes
SHA-256: a9745c3690da678744d8e617ab3049d01a3b871d0f6f54c1daddce5b6abd7e16
font_01_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10396 bytes
SHA-256: c35999c5d1e3265a7d1dbf9d9247193f2d37249f1fef2b74568f1bb20af778eb
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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