Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67e141816760095…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 17:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4c45ece97fc55db64c1e1d6dbe720ea SHA-1: 37a7838470e75335931b9e79e83ffba66fb2b200 SHA-256: c67e141816760095a8d22d12e664bc1389135ee34f97a02cd3c8410c8eaddd10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=duolingo+apk+cracked PDF link annotation
    • http://dungcumaymoc.com/Images_upload/files/65347750941.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/97972370748.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8cf18354aca1c1dd1f06c9eecfb4b60e/34011280431.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/41346168272.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/60268594694.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/59222884499.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/disapejoni.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c74b50014b---nigilizilur.pdfIn PDF document text
    • http://medi-sen.com/files/files/68816476073.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sotukeridegosatak.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/51386381687.pdfIn PDF document text
    • http://julianina.dk/upload/file/8658533622.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/51373516782.pdfIn PDF document text
    • http://moretonassets.net/userfiles/11680758041.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/vilapojakuze.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/57581893189.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/mogikopuboraxisizufemukoj.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/32489695726.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/denewikawisawovokijak.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/27125583739.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/41b0de6bbda2517dbcc97ef590e7fa08/wijomovewow.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/lejuzimibumakugenogixaj.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/45871606704.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_off0000afc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC0 14604 bytes
SHA-256: 9a30f04f110a33082e0df8e8958772bed4871ca2616e1aaa0f0935bf66afbcd0
font_01_sfnt_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 10616 bytes
SHA-256: 5534c83c6da1c7bf106e4dcde9c5e879f5341cfba7a092f18f607690091ba21b

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