Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1961b04b7357f9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 16:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ade620ac33d0e52ed13bc6e4abbe3cc7 SHA-1: 9794f1cceb7f4fc60e328fc08ebce6fa5f8e03ce SHA-256: 8f1961b04b7357f92fbb5c1667ca0709d6aed4d41e63ebc09062f7f3f6b44a5f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking direct user-facing content but containing metadata that might be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=how+to+save+website+as+pdf PDF link annotation
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vinaruzuwepawomufoki.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/2428295345.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/sowifukunuxu.pdfIn PDF document text
    • http://adriennemason.com/assets/files/ladatezemojobalixawotowov.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pofelimu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/80446830374.pdfIn PDF document text
    • http://flirdining.com/uploads/files/57944777699.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/dusibek.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/jijotuwoxerodaxufuranisi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e629da153---getopodijobojunin.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/33739844981.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13211445763.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/29858423906.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/rojazosufarusebipasu.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/63031305535.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/popotatife.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/565864220.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/13878335567.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sepumodagobekesezefibisu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/af7d7ba340a9f373d822e3212b760969/57507284081.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/maraparabexidifuz.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/59820397190.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/42651859498.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c656e9b9dc1586a11564a6b5de9786ad/19570066577.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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 17536 bytes
SHA-256: 042fdb5e4da234d34d1bb167e70caace53e3c40f51c40f87ed85c57a1378e534
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 10524 bytes
SHA-256: 829703ecf5d4c78409b955007291c25e2e1d3058492e717c91f6fdf5add451b9
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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