Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6cb81d57df742f…

MALICIOUS

PDF

99.4 KB Created: 2021-07-21 02:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 454ff971787461f3a0011c93e7192d7a SHA-1: bfd341d8a06451df1d2d9af32234fd27660890e8 SHA-256: 3d6cb81d57df742feb9521ec5f3b433e637bd356799ba26dbc53181c7fb90227
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/b3k7ln4ecftj7fj8e3qfet26ih/jamawom.pdf In PDF document text
    • https://mojer.bg/files/giwod.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/52257083435.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa02894f3---mixegujizixonejug.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pp08mgbsm39jr1bqmss061ibs6/baboxo.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/fovarojowe.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jba05r64tcd847l6a8t7narsb9/xasaki.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54214c38b---dorimiguxosekenibokiki.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/20374800583.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/94f93efd18ac32406c89bb8ea5706ff6/josiwotexatoxelume.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/80312191024.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528191505163897.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/67542856959.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/36931732903.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/povutuninixobubo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8527231da---roxinevo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/881c4ebe58b7e9876ffb4547c08904c8/jezuxevoteme.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/85643930954.pdfIn PDF document text
    • http://myredm.ru/uploads/file/6863059882.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/18492618955.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6016419871---xeposofovataxutozawo.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/8790224979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=words+to+describe+someone+beginning+with+rPDF 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_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 10828 bytes
SHA-256: 02dfd748c0bc7c59d6027782159fd54e03c23b4cbb1cbd20c9a5218d5abaaa5e
font_01_sfnt_off000137d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 17872 bytes
SHA-256: 92915c38110a0342c7149f25dbca580d52448047960d72fb85b4844416872ce8
font_02_sfnt_off00016660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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