Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d171fb446fcafa…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 06:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9c3944572175573e9b06dc6c14aac06 SHA-1: f28ec5a7ff8949150aa42f69ebeb37ea02d06835 SHA-256: b4d171fb446fcafaa972ef6ba3bff272611e1e5fa6150d2d0db23dfba5232e24
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://agro-pasz.pl/ckfinder/userfiles/files/75647254942.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/15164244892.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-27/20210827165216720663.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/92c90b7d070fedadc2eee2c05cd75a0a/tinibireliw.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/wovudisev.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b3f65ea12---20523735133.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076507a93d11---6338713865.pdfIn PDF document text
    • http://freewest.at/niguzawugetojeb.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fewumabatofabenaxanoledor.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/30431166405.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608585bfb8bbd---bomoxefox.pdfIn PDF document text
    • http://fabtur.ru/upload/files/96731567867.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/rewiridafezawalabuzo.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/84590240936.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/990e13ba83ce0529bcff93f8b67546a4/16018630985.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca75a88d25---82911916798.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/dc2177832d1960c103482721cd544759/17304553142.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/2317196752.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/figedututegatusi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfc50e31b---43732219150.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/rubet.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/52bc02df5c42bb02fcc137a021c3b5c3/71351984074.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/gipozugululuvaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sieve+of+eratosthenes+worksheet+answersPDF 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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 17364 bytes
SHA-256: a6b6d2d0296fd55e993a1f83408c3678669d341db429e47bc31a898d5cfd5667
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10584 bytes
SHA-256: a20303625eecc990257a0877dd8158971f8b2f7cdf57d6a1fc227b84bfb7ccdf
font_02_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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