Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ccf91dea8cc3bc…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 00:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dab4727855d3a19a3e8e1b4cae5297cb SHA-1: c1057e09f21a074f30649bb4781b1f6b3e75125f SHA-256: f3ccf91dea8cc3bc5d831377cd60c56cb51317d6726f0629bd7738214883d2a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pakistanchristiancongress.org/userfiles/file/9095423321.pdf In PDF document text
    • https://muratay.nl/userfiles/file/53463754128.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1551fdf0---60605428651.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/49076795241.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/46108046168.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eceaf39875---6906829589.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/45970286634.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/sularexafene.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416124c2fa6---40412082591.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/78741658938.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/5418731155.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/nirojiwazuletumezu.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/81613397922.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/kadipawopizukapapekepeni.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/13421238238.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/53920636620.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021092216191373499.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/17884718408.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/97100814977.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/84790751629.pdfIn PDF document text
    • https://istanajp.net/contents/files/wazenipoto.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/bozimitow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cara+install+file+exe+di+androidPDF 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_off0000afa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA1 17792 bytes
SHA-256: 46206ee27447baf32440baf30893c89a9cc80f2800ce385640af71e5a342e9a4
font_01_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10480 bytes
SHA-256: f21c06759d3f2618cc1ed06c74ef2a00e8ebd3a6ff88f152221c6b58b6189d5c
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1