Malicious PDF — malware analysis report

Static analysis result for SHA-256 62431fed8143eb95…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 23:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb9a6385892afff2c7ad8659cf9ffdc3 SHA-1: e57b55dea87308bf1be1c51434f0d3ddcc7b51cf SHA-256: 62431fed8143eb95aa87c3308e89bdfd42fea59e6fd4a7665013c5909ad1a893
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, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on potentially compromised CMS uploads indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tks-forever.com/upload/2021/06/24/file/70515923020.pdf In PDF document text
    • http://goopenapp.com/uploads/files/62802403593.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/156829af593319d756538e2a0c014a09/pasupurano.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kizavufisevoketilim.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/dfd3dee7d0c425911c5fe200a6f6fb0f/13381418591.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5b83f04a---59081866115.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/bexamijebegavu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913fb7b918d---54410256570.pdfIn PDF document text
    • http://dnepropress.net/files/file/17362651869.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b847dfcbb8a---19903088477.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc82cb3fc6---vanidasaboweludu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e132d7eb---41812720048.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/22454057117.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/79338771985.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nuwex.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/69580872806.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p9bchgguhnrs9i0s243r4oufdc/rizawo.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/94574706126.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jo5aq3kiva66p14s1kvrqd16h9/buvajonaminefagob.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/27928058231.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zuditip.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe2d6727b---betavesolegoveto.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/39912798372.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7af28357---lubumixeridiwuzoduwak.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/30050004099.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/fudowedoresipatuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=printable+times+tables+worksheets+1-12PDF 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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 10900 bytes
SHA-256: 6016ff451796d7ddbdbd56a2263e9826c91be6b9f9fa3aa0ba782398f92595e8
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 17052 bytes
SHA-256: dafba3f2c4050e331c3d449b2b7765ea779d2c9777a36b8c92c89f1571c91c11

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