Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63c3ad8378b5294…

MALICIOUS

PDF

83.5 KB Created: 2021-07-09 03:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a56dad23eb6c332fa3214bf349aba3f SHA-1: 1814d2dac97beb6484b5e73a50f6896ce8cd8e64 SHA-256: f63c3ad8378b529442a303a3e7cbdbd58357fb87287e7a4afdcb2cd1ac2788ed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/kezizowuxizozusub.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/ce543109f706375f7b2914c41a3956fc/fibowapokevudomexogurad.pdf
    • http://garderoba.sk/images/_file/97392219471.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e254a78bf1---kamegugo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0aa0231823d90a72b9619a36364eb59d/xitamunatajuzuretalutu.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/18394746630.pdf
    • http://www.huntsvillepr.com/files/files/xatuz.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/51859115755.pdf
    • http://poledance-chrudim.cz/files/file/sirimivosuxelatuwunura.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b32a103f7e60a1afe0994072055ca9b5/66011162862.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/788a662b47d1d2205adb9e1c1515b24c/92174601114.pdf
    • http://yonseri.org/userfiles/files/xibomitegu.pdf
    • https://alshamiltrading.com/alshamilfiles/file/guruzaginogigujuvipofizop.pdf
    • http://learningkey.org/userfiles/20988597615.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb342e5ef---nodepat.pdf
    • http://lpc2529.com/piceditor/file/jetulibidadafetejewe.pdf
    • https://avonsteel.com/UserFiles/file/sudiretarutemiv.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7c43ea4faddd8e0eccf35ec6a1461912/lebapijafox.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/tunazusiwabigog.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5785d8eee7c486b507ad647a55ed6afc/mixeb.pdf
    • http://maciejabramowicz.pl/upload/files/file/lazafilaxobawomina.pdf
    • https://air-separation-supplier.com/d/files/gibuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=c+programming+puzzles+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ad.bin
0ac2ca458162bafda04e05930267e009af056d24a109b797cea3d5ae4fb2febd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 11220 bytes
font_01_sfnt_off0000feab.bin
c91a1a5638972966d7718c0186341b5cbef8d0ecc85abb2cd08e59daaa8046b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 16260 bytes
font_02_sfnt_off00012885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 16792 bytes