Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8350245f1ba3ff…

MALICIOUS

PDF

87.4 KB Created: 2021-07-31 15:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54296c033248a953e092620615ef6140 SHA-1: 7eb3b1077032e7da0a09bae916495081d07e2358 SHA-256: 3c8350245f1ba3ff5dd9f4e37dc8b61e2e1922600fb853fc2c6c1a99b7982e78
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://oniceh.ru/uplcv?utm_term=mru+ejercicios+resueltos+2+eso PDF link annotation
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/lowadaweligiresa.pdfIn PDF document text
    • https://bselink.com/userfiles/file/41773824475.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/82370358203.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/9812155819.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pofoki.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/jokarogoxinofaxawisaxivab.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0052720f318afb5eb6da6533feade56d/85942429316.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8b6304cd---58223170505.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/vegoviwatumafatibawar.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827ccab8988---40587553064.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b4b5999e2---bezexalepamijev.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1lem3h0t1pugllpeqr9rpghbr4/97492543743.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/53529371501.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/97358738411.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/podegorelaxitopi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ccbb7de1---75294838798.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qm99hp3mch246lv9hs8rlihps2/43666859990.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e15b1a24850---giros.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bcd7617ceca90009a15a0d44e864d8f4/77458343786.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/49pqj9sore1etraosvvokhjeu2/nenojawitomikaxorul.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/26460503602.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860008a175f---nodemorejaxixinin.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/64411758800.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6scdfk998l8ntpj4niapa4od87/25345468743.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/598ef6f4a33acb4c568db2018b818d4e/51082012736.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/25173674133.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/40759197926.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_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 17656 bytes
SHA-256: cac263447c86c0bb560083e341d5b83c96e33bdb3dc06b6a824ccc0eef1af516
font_01_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 10300 bytes
SHA-256: f001df02724d6a909f1ac9d6bd91128012a0e2a58732a905d75b2ebeb3cb1e6e
font_02_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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