Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9f9dcb773aef8d…

MALICIOUS

PDF

91.4 KB Created: 2021-09-18 12:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 688c5fca0d219b48347488d2662c50ce SHA-1: 66c28f926788c87c6c7385e1b6348301a3375020 SHA-256: 2b9f9dcb773aef8de4853707058bed7f92fca5d010bb8830bae84a7dd58f3ff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rococosofa.com/files/files/98990210023.pdf
    • http://bienbao.org/uploads/files/zatigutifatij.pdf
    • http://kartywspomnien.pl/uploads/assets/file/diginifubizojeminatuzos.pdf
    • http://3sdent.com/upload/files/70733254252.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc58d346c3---43177034821.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326fbc291d3---xoteriwuvagotebatagadedad.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xagekofugodowetixefefepif.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/42db88772fa67f0d0009b7d9ee8761f0/govavelitita.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5d6b00d1---19811702833.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/80674798254.pdf
    • http://bivalyracing.hu/files/file/10907814818.pdf
    • https://semagro-msw.ru/pics/images/file/72507249771.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0pdmqjlp3v2s335h95oqsomk17/sovofijapasixikibuxidus.pdf
    • http://xprchemical.com/upload/files/4202282326.pdf
    • http://www.fashiongale.ro/userfiles/files/gufetajelavumalesijajujav.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/kovofenudifipifu.pdf
    • http://klusjesindex.nl/images/uploads/20852976988.pdf
    • https://trouver-une-ssii.com/img/pics/files/51408946605.pdf
    • http://anhbanglaw.com/userfiles/file/6251467049.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/juladulusexezekoduvuxo.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/xefosilozag.pdf
    • http://aalzkj.love-mrt.com/upload/files/40077217258.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=samsung+galaxy+all+mobile+price+in+bangladesh
    • 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_off0000fc28.bin
b8c87621894cca02a1c0dbd80a85c1c0d94ff6b26a6195dbd918721002c91bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 11392 bytes
font_01_sfnt_off00011658.bin
e7def255e5578f9ff4aeaa995524677b91f5d944ee01902a8b1f6fd1a315971d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 18836 bytes
font_02_sfnt_off00014800.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 16792 bytes