Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ee6aa75730cd9c…

MALICIOUS

PDF

87.7 KB Created: 2021-07-14 01:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e8f92d3b568131244170e7e6ba3edc9 SHA-1: 6dae2a855cab5ebfbe34b8fdbfe6d048cc4033a3 SHA-256: 35ee6aa75730cd9cfc56d3e6414c4bce3bd216b4c3385d7d4c3d533c3a0f6968
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be compromised CMS uploads. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of redirecting users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=is+bahai+a+universalizing+religion PDF link annotation
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/35557250293.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/40028543491.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/naxaz.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/39894531622.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ca47ee6b---pituj.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xerupoge.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cmsrkkd40vuaapr21076isb16i/befijijazarafuliposim.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8f3759310a518f12c15b2f7e195baa34/71794526007.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/fawifol.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160860b9b6394d---telonivewa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/39597969914.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702a5ae2bd3---16498469128.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/sepinex.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/126abe5266a16e38a0c302404e346527/29509271410.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b559f3bf5d0---malirufova.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nivivexufum.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/72107098810.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/soxepebif.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/2782993412.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60b99bc3c---80514780285.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/55745018636.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b92a8d26101c1c60cf6e4a79306446f0/72919179359.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/94e287c05fec3ea5798132f62d78c2be/soluzuwibaduxunase.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/jovowular.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 16616 bytes
SHA-256: 92818c4f8fc0eacadafc762aefbb55bafd31008d2b98ba5f015d7d126f0eb93f
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 10604 bytes
SHA-256: f5bef323f233820a37e04ad4698e35bb98f0ddcea41605c20f56afea270794cc

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