Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3a33c4b07c8e64…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 11:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6fd452cdbc8b3896877c252598c09b51 SHA-1: e97140979a1774f64959bb79c94f516b012a350d SHA-256: 7d3a33c4b07c8e64f2100463c8d9e0470253231cc6dfd94735685d59ba1d9d9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=android+phone+number+unknown+fix PDF link annotation
    • http://phubozena.pl/userfiles/file/23494982072.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/rajinepo.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/pakumarogod.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c728a2a0---misuxenibag.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/vugobizikoj.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f511764c1a---burasijagudidodegewexanez.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95115974695.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/71772587590.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/31781544535.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/99776217382.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/90377585027.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614743289f289---60229437543.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fa3985b7---netanira.pdfIn PDF document text
    • http://xsteelstock.com/d/files/31386317090.pdfIn PDF document text
    • http://czyxchem.com/upload/files/rezusozitelejonirulomaki.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/kinivugulu.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/9248938994.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/72279969152.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/64135104343.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/45005766113.pdfIn PDF document text
    • http://irollee.com/userfiles/file/powewapuvanaxizakumoto.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 17720 bytes
SHA-256: 70cac3384f3acb11d7df08522456106818438f897fa8cf3303ee49f9a9e11d53
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10792 bytes
SHA-256: 40d36a5600dacc4573a50eefc729ca8ca615a6acdec7e9aaf5fc955be219d717
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1