Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d3597ff4ee5808…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 06:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 218e48b97c010db86b3f257fc40fe7ae SHA-1: 94c19b4969e53447d0bdb7fc789f5ba0c2fe7ff9 SHA-256: 74d3597ff4ee58081d21c3215c5fc461510103989ac9c358c907eef44c79cf74
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16146936782947---21697040247.pdf In PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/40745066862.pdfIn PDF document text
    • http://xprchemical.com/upload/files/jirugazeta.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/89367846699.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/kanufuk.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/96431034200.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/84568672595.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/sizovigafamav.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/41081816362.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109050054075284.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/36397369192.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/556c8c0f2888ce031d6ae0cc839f9e92/besobubizetuvavodix.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/11332041451.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/ninovetekizabefiwe.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/90439061371.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100910507246.pdfIn PDF document text
    • http://tulga.ru/editor/files/92811067066.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/37279058506.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/kivefaviwabekabuseb.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/getemepoleves.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/939e9270d46127633a72df005851e8d1/sizujozugolekodit.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210902092356.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/96705073179.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202193125254281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+hunger+games+catching+fire+freePDF 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_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 17112 bytes
SHA-256: c7673ce366fccc15908c1f1221777b8d78ed5e11df1cc253a4f4fa7e907eaa26
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10712 bytes
SHA-256: 68f4037e8cc0498004d0d0f6276cf8285affed2ebea0f52c19f31c34d1dcdd26
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1