Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd125dc4c7f555f…

MALICIOUS

PDF

92.6 KB Created: 2021-09-01 11:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bd056e28f943ac16bfb37fb880a04e9d SHA-1: b5bdbff755945e802482da7ecc7e0f12b2a77b90 SHA-256: fcd125dc4c7f555f7312e66dd9e1f977e9ddb61d168153642fac741c79a3b7cd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malware or phishing content. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0dca80889---javetorafozexoxi.pdf In PDF document text
    • https://genia-groupe.fr/images/files/87285805204.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98461009152.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/fibederuwesisekoxa.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/92632046208.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/85398388719.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/55260670702.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085231e7a2f6---buxagez.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xofakegumalumilavomimizaw.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/88978723874.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/17570112864.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a1474757e---54047415640.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ade9fe515308e38685a2b436848c858d/nipere.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b225aosnsmu25005eqi7ar3kk2/vegofud.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7cab9814---34191755560.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9b42beed4524aecc39fc2f5b7f66d9da/dumapunewufagewumi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4e7528d3---bojemokamabew.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161249d8dd6701---mexoxofu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/80338866665.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/zazibadakijixa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1dfa9ab0---julalox.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/61291801894.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/407d4b028a72c9de489cc3a0369136d5/16398436109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+thorn+birds+in+10+minutesPDF 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_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10680 bytes
SHA-256: b9df8292fcc6559083e1c4bb650729ac7d486852bb48c19a439c962ee5cab2f4
font_01_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 18388 bytes
SHA-256: 272fbd5869ebe68d171ea0bd3a903f6cf3a028097938b4eb97677017bc7608b2
font_02_sfnt_off00014ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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