Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b858f7af61226e…

MALICIOUS

PDF

73.2 KB Created: 2021-07-25 18:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 400b331a7a09ad63fa311d3b6e472307 SHA-1: b5479738bd74ba0d31fbf1a743e104b241ad9df1 SHA-256: 91b858f7af61226e2cffaabcec135638e5cb23ff7f8c04aee8c0d5830311bbcd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://tydafa.com/dafa/uploadfiles/20210628120935.pdf In PDF document text
    • http://chromowane.com/userfiles/file/badisu.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/79507710613.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/fakuxovurobogad.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/9018642290.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9901cb1af---98409831107.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d175684cd57ef43c44017c06b22acf59/dikezagudete.pdfIn PDF document text
    • https://aedwea.com/upload/foto/murerusedinax.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e995f9d3fa---dumodovobefu.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071600432670554.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b483d77cb---moleloj.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2927316b---lelixudukavaleju.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78kok2k1cp5te901cudv9r22q0/33511393171.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lopitigesedajar.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/notativoxevisif.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/59573635919.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/towujolozagada.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/12219926583.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a2ee66dad3b4384b957bcbb855bca24a/riruludenudadijegusim.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/badibigiwopubifutajajusel.pdfIn PDF document text
    • http://www.heksan.com.pl/file/bafomutugodub.pdfIn PDF document text
    • http://vodnik48.ru/content/file/98659317817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=suma+de+terminos+de+una+progresion+geometrica+ejercicios+resueltos+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eee15c847---zosobuke.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_off0000bb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3D 15244 bytes
SHA-256: 9c0ae5e4d804f46c1d7d4bb96373722350047e2a157a03ae7cd360ac3ac080fb
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 11268 bytes
SHA-256: 80bcb4ea9de100a4d3e0c01e53c9635a99043012eff986d5e4eeda83681bb7d3

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