Malicious PDF — malware analysis report

Static analysis result for SHA-256 d295da31e32a8afb…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 18:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1ec5600c8075a54bda57d0397da4b05 SHA-1: 0aed74bf0a0fb1895b2e6488e4d0fba50bc342eb SHA-256: d295da31e32a8afbf81a53fba23d9708d743dbec19fcdf80737e2252102dc238
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm strategy. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically suggests the document is designed to manipulate search engine results or direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=lg+solardom+microwave+repair+manual PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ee3a5eba---65936725908.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/fimejat.pdfIn PDF document text
    • http://wohingltd.com/userfiles/jolakeditunava.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/43237704819.pdfIn PDF document text
    • http://newmob.it/userfiles/files/33493555660.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/kekito.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/libevasof.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5985807fc---zuxukilimozex.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/23623978575.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1bc968e28---gafigituwabam.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gijexasurozu.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/lelosisiwewudiz.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/930db03db0c9f0837b494e1446b09ad5/99462514291.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/vuvevetezefipamitipi.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/96818487539.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/jisesipugidak.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/68080547643.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeff7c138---57452027866.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061601120573499.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/8319737616.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/beliloz.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2726d843e---latozif.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/31320166797.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3e68bb51335f9ede3753f1056879d04/80402473790.pdfIn PDF document text
    • 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_off0000c5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D5 10968 bytes
SHA-256: eeb3a6220db56b7a3d4df8eff16026d7e84a270a46bbb3c190787c40c2735b21
font_01_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 16236 bytes
SHA-256: be56d3349c624c25fcf1fc0248b16c900a9ef98732f3c78d90b65a911b4d6b6f
font_02_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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