Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35b2c1b7fe0d623…

MALICIOUS

PDF

73.0 KB Created: 2021-10-01 07:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a63402a68ee3a21b130a47f38f20dc5b SHA-1: db7a6e0e58b3c0216e0d78fbdbba2ed53c1bfc7a SHA-256: f35b2c1b7fe0d623cf769a22b762fe03876133b30d71609364562419db718477
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS uploads. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=print+web+page+android PDF link annotation
    • http://saint-party.com/media/file/biviwiziw.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/fudefoxokamugikadozoz.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/26359743005.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/97641877666.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae070bcc69de5587ade90d733633b997/28064157787.pdfIn PDF document text
    • http://sql110.com/pic/31439136148.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ef89799a1---liwudanawaxepopafogopojam.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/76167472120.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/50732217257.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/fabakimo.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lofegovejorobabag.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jasumidodokinas.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/mafogumoreguwoduxopam.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/54467472960.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/pezosubafagamibozegad.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/10431876117.pdfIn PDF document text
    • http://podarox.ru/public/files/zesapalisepipikarev.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/284ad46fb0d034d88793410595ac0c9d/23590054179.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/92677724823.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_off0000b7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 10580 bytes
SHA-256: 0e1a5161d83ba03200a077d9e0c2d699d5f4784ab0ae3605b347216cafeaa01a
font_02_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 18256 bytes
SHA-256: 6267e369ec3d8b2f2695873f4f79c7827b51cc7125c9772faeb8b3ade2d496d5

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