Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f03edb8faeb53b2…

MALICIOUS

PDF

69.1 KB Created: 2021-09-10 06:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70d0ce01dc147e4b3afcc0258cc59f34 SHA-1: a2fc876b16c226e4feeb55c299644ed4a913b225 SHA-256: 1f03edb8faeb53b296d06b6ba7370a906701b8336517396def0b64c4416e996a
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, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of numerous unknown URLs reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://slsnn.ru/content/files/winute.pdf In PDF document text
    • https://zenit-npk.ru/files/file/73648429706.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/10613273936.pdfIn PDF document text
    • http://horvathortho.hu/tmp/91082802945.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rexiziposopexiteborakeret.pdfIn PDF document text
    • https://medtek.vn/storage/file/zudavovu.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210909142805.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/64179530988.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/12330728207.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/pijuso.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6704deca---94485396937.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/24664584432.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/donaz.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/i58mi1korih0oo3rbgcleds070/11181975739.pdfIn PDF document text
    • http://pk.mo/userfiles/file/60317023210.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/34410318491.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2d52cc49f7892454f121ec3b460e49b8/fugiwaw.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/rixovukuwudisetuben.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/virenilopimasetigudiboseg.pdfIn PDF document text
    • http://195exim.com/datas/files/lolonifalutikaka.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/bagafomo.pdfIn PDF document text
    • http://logicamail.it/draft/media/vewodebuliporubeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=subway+surfers+apk+hackPDF 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_off0000b26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26C 10724 bytes
SHA-256: 881534e1aeae0781962bf7ee3204f45f0d65ca1de615a6d2ef43e0fbba21128c
font_01_sfnt_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 14456 bytes
SHA-256: d9d72a923ef06ebe2041648660da70e32c980625657d71780561853e3b852c59