Malicious PDF — malware analysis report

Static analysis result for SHA-256 d295a1af524db84b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-26 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b4ec5e4b8e69c043fd18f7262706fac SHA-1: 389acc6697ec2bdf9c5f4425c1cabd6b483392f9 SHA-256: d295a1af524db84b31e6a990be211848819ae85e84c1beed8a65bc2c370fdd5d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. The file's structure and URL patterns are consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/12941829369.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/95f88805e718a8d49d7934a75f10b394/fazifapowuwusawodafadili.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3f314194554ba65d74fc1d44619c77a2/vuwukudogonadasezad.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ec39580f---38953525660.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/rebewosilemibusavetixus.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/72852017708.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xeravaxolujaxugetoso.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/589kpnos9n739qkc33toqjo750/29679908834.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/nejafipugokupavobedax.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/forogureligevojagasez.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/10932678399.pdfIn PDF document text
    • http://airfa.it/userfiles/file/wiguletapizomolivuzem.pdfIn PDF document text
    • https://comfort8889.com/upload/files/92082531239.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/93482597009.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/80516925547.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/segadige.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/30486432991.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/88327416471.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7f8743d6---23385960023.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7b57ea8fabdd7c307177b986730fcee7/dovugininopimisazadaren.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/ginikanaruj.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/81462398955.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca188c781---zipezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=k%C4%B1ymetli+evrak+hukuku+s%C4%B1nav+sorular%C4%B1PDF 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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 18916 bytes
SHA-256: d45b2d0cf1b34a023da20452b6b049f0e2d125342d6e409e7dc06c515a28d923
font_02_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 10780 bytes
SHA-256: 367b6270a7585333b6d59a3368e32491527a21a29b9fad404057b67dc1831de7

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