Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b535afb2459a165…

MALICIOUS

PDF

75.4 KB Created: 2021-09-23 08:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f44bfe9dee29ada9fcf85b24a05cf0f SHA-1: b04481c7fd4fb9b7c9e2c0630af7bfa9b4ba7329 SHA-256: 0b535afb2459a165be15a853317cf6500c3d78baa8b3a207b6a20629878ed1d7
156 Risk Score

Malware Insights

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

The 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 potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://drafthe.ru/uplcv?utm_term=friday+night+funkin+apk+whitty+android PDF link annotation
    • https://cheesykeju.com/contents/files/11176259736.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210921_7959CC4C3A398D65.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1ea49f6f---viniforuve.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/71330243367.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e99a48f1---lubijizatalife.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/zofavag.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/sisopep.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/15147748380.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/roxere.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145ac2231d29---dowofulep.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/bamalip.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/62895945372.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/dilufegaximipabenuri.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/80467920097.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133344e9f81f---37865284027.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/55099371161.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/db3c7ufkl5kfgj17ttebu76ua1/nunekodiwej.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/23750035024.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/75393070577.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/duwisosujijapujaxavetokix.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/05c7a7d6c6b6c556281b017594c278c0/7658112067.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/52675193148.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/labesuzetawadafipufituwur.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142979885190---1348373617.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/62409107470.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/9661502531.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/67666832078.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6654f32a9---ramawagusasoreme.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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 16892 bytes
SHA-256: e4882008c640e62331597ca7fe961938da9c21e7b253d35118cf55df92a96118
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10800 bytes
SHA-256: 9f5407acb675c384ed9f40a5c038c6fb1a70a31d3476881d4698b644cf17d6d8
font_02_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1