Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d793d29d3601d4…

MALICIOUS

PDF

87.2 KB Created: 2021-09-15 03:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cd7405c76ad23951f44576712a0f43f SHA-1: 4892d343d4490e8ebc6412f1dd6689fdaaf25c41 SHA-256: a9d793d29d3601d4c982b4f31b5aa2bd29109ab647f8b3ee084fadc14fa4ed41
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on domains flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411df4973f6---momabiko.pdf In PDF document text
    • http://ciskmv.com/css/file/tiruvizifurutororazawo.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/96444984500.pdfIn PDF document text
    • https://777mto.org/contents/files/31663352382.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pesefijonemutizigopo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/midepiwurig.pdfIn PDF document text
    • http://chipgene.com/image/files/20210905_233452.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/vonokamul.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/26685234170.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141226c6956d---golebivot.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/dosifudeg.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/46499188969.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210908191228.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/9696732345.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/niwaba.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/soligebo.pdfIn PDF document text
    • http://soupworld.de/upload/file/39301712538.pdfIn PDF document text
    • http://th-hl.com///upload/files/61983150482.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fufipumotemokali.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f30be512---winamixosijo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5aa413b6c---81637593562.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae3162abe---971538339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=red+badge+of+courage+pdfPDF 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_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 10572 bytes
SHA-256: 50f4dfc11b3bff17fa39c0c64ed98d6f545a1d5d8c0adc153de5c0b5e2ceee70
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 18232 bytes
SHA-256: fc47a8bf9d2cba77ca160ea60325db5f1d0be5345608703d742ca1778c4f58bc