Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3a3b9eb05eb609…

MALICIOUS

PDF

94.5 KB Created: 2021-09-06 03:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 355b8d40bb58801be3561443ad0c394f SHA-1: ee328a5813a042859e601806c5811dbb31c3ad41 SHA-256: 1b3a3b9eb05eb609bf8ed5d5456640b6d4e86beaa0afc0f33c7fb2edbbe545ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

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 http://liyangah.com/Upload/file/jabalonixawetav.pdf In PDF document text
    • http://fedime.org/imagenes/mokager.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/23323216786.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877968dc4---40222495459.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bee4bbeb124---51609892420.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af594ec39a---gaderaxoninanilafi.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/butaxumudinitipufura.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b111d95ec98---ripemozuvibalizevalovabat.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/46413793791.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161268383ac59c---tavodumibifuzikixid.pdfIn PDF document text
    • http://3q1p.com/upload/file/2108271657291526261webpgxf5jpg.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zatibid.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/86126541987.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/90506902703.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/94006199483.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/nowakuwaforotano.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/vobogananutut.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9ecc6c02619916ddf90f6c62d46efb01/mubukidoj.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/40614746420.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/53508288912.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/58ukhdvcabrh8rn6b6vj1dh720/23206072216.pdfIn PDF document text
    • https://chp-travel.ir/data/file/43988994997.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/karomuxiwavakokodufokuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=parasitosis+intestinal+en+ni%C3%B1os+pdf+mexicoPDF 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_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 11088 bytes
SHA-256: df8ed27b5187e8ce35e89ffc2b50f27d7adaf33bbe58d1099079f8c9c58b051d
font_01_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 20252 bytes
SHA-256: 7cc73ef99f8e1d03040f6183ec31838d24659f96b59532c55f0b779e0d991577
font_02_sfnt_off0001527e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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