Malicious PDF — malware analysis report

Static analysis result for SHA-256 293b36eab0ed818b…

MALICIOUS

PDF

80.8 KB Created: 2021-08-12 21:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1464bef6c47b048c3ca74421798d9c7 SHA-1: 6e4076234ea09250f728f9b9a126807ed786e43c SHA-256: 293b36eab0ed818bdd55173b276405f2d1aba5644ad7f0e56f4e3dcbeb68cf95
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to potentially harmful content. The PDF structure and link farm characteristics are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160971963520e1---duvalokadawatavobigimadu.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdcd475939---bodafarorojukumejebutas.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/001a89ce294acfa4ac59780318b6abf8/21455757131.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lefuzo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/75334306672.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/wapitisivi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7p90qdm3ifjt722t4roaprn17/kalizovitowar.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/65588046281.pdfIn PDF document text
    • http://ecole.ru/text/images/file/2252555881.pdfIn PDF document text
    • http://geose.ru/userfiles/file/rezirumiwowoxaminat.pdfIn PDF document text
    • https://svltv.in/userfiles/files/jezazozezewuvora.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/xidosolofutovogojidegur.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/42092224765.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160becc7575bfb---rereb.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/jenutedosi.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/sinolukixok.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/fbbefbbaee7915cfb041c0622a979357/4838561093.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/76492055387.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/m386ab59o64iig5fr6rsgubr2s/lufebopegozikidavoka.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5edd5565b---jesofi.pdfIn PDF document text
    • http://poorclarescork.ie/images/21280181631.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/15201779f05140e65a849771b3fe0d59/zowidebamidubutifemeris.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/22609179511.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/97623231616.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a526d111c3cc57c06922ef904ff0efec/21156369941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=number+flashcards+1-20+printable+pdfPDF 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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 11308 bytes
SHA-256: 7f517176d3da699f0daeaa6a280d383d582a70a91986c98a4c9f1ac63ccabc92
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16448 bytes
SHA-256: 9317ac14ce169fd3a9c78f58da7a6c9048de8899d93a2f6faa62cf8916103570

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