Malicious PDF — malware analysis report

Static analysis result for SHA-256 a163eea6be2475f2…

MALICIOUS

PDF

79.4 KB Created: 2021-08-06 22:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9f3a518aeafa0643be973df544e4653 SHA-1: dd8b9520b0ebc68d1786058436b7b3fd07f6adc4 SHA-256: a163eea6be2475f2881722bdcad5a9fea054cc7285e9fa677a3c6e1488e154f2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.bandungmesin.com/file/zuzunujul.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f364f664947---luzimuzeno.pdf
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/25102702861.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812a5f9ad02---45857074131.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a722e4e8c3b---nupupidosuxelafizi.pdf
    • https://costabravas.com/uploads/localidades/files/31940805282.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5925f17993---pemikufadamizemexe.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b87777c49a90a9156a6322d33d3e8a96/wunafisabagapipukomiju.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42e03d50ea---dolizesuropazijepiwe.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb440ce635---zodatajatevomamivimamak.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ec48ca1b9cbaddc2483e1e90aea81ef9/411444349.pdf
    • http://cristal-in.fr/userfiles/file/vemutuzasivurunedubu.pdf
    • http://fly.no1-yes.com/userfiles/file/kamerevolugufumetoke.pdf
    • http://alibabashipping.com/userfiles/file/92656634744.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a4d4bd9b0a8099349d74355f6723e9a6/49313705537.pdf
    • http://dagmare.de/userfiles/file/nebomisabez.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/38652476519.pdf
    • http://azizolace.cz/images/file/31482943908.pdf
    • https://pecsikult.hu/files/file/87873274925.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/99751199717.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fbca9c88e958257b5780dc6ee06a22b8/72879659818.pdf
    • http://kistours.hu/userfiles/file/88913269853.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c04feb8244f---2938633306.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=beowulf+discussion+questions+answer+key
    • 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_off0000d1d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 16792 bytes
font_01_sfnt_off0000e9ea.bin
a82f068c1718dca7e1a03a1092fdd558481b60a21392d60b76feae0c21f6f33a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 16936 bytes
font_02_sfnt_off000115d8.bin
5a58df426a1f5b8be338e4efda123576297d61ced4d8a20d1756e857d9f9f633
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 11060 bytes