Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9313d19dd16173…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 13:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c37aa2d9e2243cbca3c31c08e6a223e SHA-1: 6c0e0fba061da5b92c8d0cb71df725671afb3f0a SHA-256: bb9313d19dd161730762e3107a558d4a46f0824bb6076923ed288c4dbc79b8f8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics fired, pointing to a link farm strategy where many URLs lead to external PDF files, often hosted on compromised or disposable domains. The presence of embedded URLs and the overall structure suggest this document is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=quatro+cerberus+members PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/04fdf785666487f818ab16b9efd5f8dd/99491555805.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/68277838817.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/8225156762.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/65271745999.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/3242927940.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109100615236604.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/99423873067.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d120d09c97---xumuwoneba.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/pegemuweginoxeniwopu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c20b2a6e691429a7830bf526fab471a4/ziwareralam.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/54162609928.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210911212205.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/48170641417.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/42698366909.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/rafegibot.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/17304423364.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/rebenevosadetojulajisa.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/53033799822.pdfIn PDF document text
    • http://dsraxys.com/uploads/31012196396.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/munogarul.pdfIn PDF document text
    • https://salonrewards.ca/images/file/62129278832.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d490802dc---xodote.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zajaxe.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/64101642887.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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 10448 bytes
SHA-256: cbc144d34f8805b1dff102a8413bbfc43739cd5d4b3b582fe759ecc852976b1b
font_01_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 18580 bytes
SHA-256: 2a713e831fbc403fc475795064e85720c668c6eb52f5c2a38c437cf75797da93

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