Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab760bf90369e407…

MALICIOUS

PDF

96.1 KB Created: 2021-07-26 18:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 687c9b194b9957d39fe88c3d34d34978 SHA-1: 426097f0f63a0117b7b70b3fe2b097f0867e96af SHA-256: ab760bf90369e40759b339825acd76e39fca61da1ff5d011fdca752fb3da74ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and link farm behavior are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b755ce29a---gatot.pdf In PDF document text
    • http://dokumsuzgec.com/userfiles/files/xivewaragiw.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/trh2r8tl8mnmv9i8satqg017j2/wizuzisefotozorimajezebib.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/36174363974.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6721a8d54---suwuguketomaraziwivexew.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0661a24e3---xoxidagikukezonesogodiv.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cbcb8d6ae61ee735c0cf8a72645091bb/kabemaxo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f08cb6453---nawepewe.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/36087597052.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4850becd---85433312338.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/27692062844.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f9bda69a---43848701431.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/28717826718.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9b8917a884---jevubi.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/nuzepibusefanonuref.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/co4qj3lo8oa1np22la86c37b7d/gibezerijelazezaj.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89574b351---87768574391.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160980b89d639e---96343652064.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d0520385---77141940921.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jizidelekebubetemabezito.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6bfed1b5ba1d7fc5f9fe0ae0a1a72532/94915405005.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/c24266ad39485e05721f87fdd0cc2ce8/32083984436.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/54744752995.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453bf22473---temuroxijovajinunulini.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/03cd586ce2c0bd6c4661b70553aae4ec/wisobajawox.pdfIn PDF document text
    • https://starbox.fr/img/files/87596074443.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/sudozugodowijigeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=libro+de+matematicas+1+de+secundaria+contestado+2019+a+2020+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_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 20068 bytes
SHA-256: 2f3a639dd18e620204e2e1d19b813d08f897556faf2e0b225d301d857b79e1e1
font_02_sfnt_off000156d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D9 11396 bytes
SHA-256: b7a667b8bc523279757059079117492368a9a44dc8bc9dd26296a5be6f5c20ca

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