Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb8cbb7ab64c12a…

MALICIOUS

PDF

83.6 KB Created: 2021-07-17 06:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dcf183d64b2c5bcfe6d97e71f2f4b171 SHA-1: 716f0cbb3b70131514c378e85c929c3c906e0424 SHA-256: afb8cbb7ab64c12a84b3e39704a29489d7d1887b97577e1d5a9b9f413a7131cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elsa-daulte.com/ckfinder/userfiles/files/bewuwu.pdf In PDF document text
    • http://terralis.eu/catalogue_dynamique/file/27676961011.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16078feb673fd3---fuxemexuwogalefibijavo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/fewumipivinobilivade.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cb64d091b367bfdd3e5872e990666188/fexaximavobiluzujana.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160984989f1b2c---94248978125.pdfIn PDF document text
    • http://teraval.cz/res/file/kakutopo.pdfIn PDF document text
    • https://ip-pharma.net/data/files/votabumu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaf66a1493---26355028573.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/20243851580.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c936f1b969e---begugaroporulezapugamakik.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/eb9adf6832a3a147515e4c633b121485/89540095793.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/dozad.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///kobijanisapojebipixi.pdfIn PDF document text
    • http://mosjob.ru/images/file/movigozubagukev.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fezutife.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63a8b9435---pejenaxubunewefir.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3c69f3c0---92666212766.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9mk7cvgu43chcvc57i8k9dcers/zizotiz.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/fenegakibigulupunuka.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/63478504935.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2e1147852a859d2621e0ad66cc48ebc6/70440504810.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/bopezu.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/72607625409.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a44f8a164---sedepabuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=different+types+of+real+data+type+in+cPDF 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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 17512 bytes
SHA-256: a0c44315f777e356444b49042df272b29c0009d38154f497619a1ed9869c685c
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 10728 bytes
SHA-256: f895df10bde3a252d0dbccc020a759aba3ca0870d12869250e81495fb12a6495

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