Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2adecca9cf12d8…

MALICIOUS

PDF

84.6 KB Created: 2021-07-12 16:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf9eef6f3b036236e2356131aa640a9d SHA-1: 91ae362e0f7136442a23774a05855f53a6d386b6 SHA-256: 6b2adecca9cf12d8289b7ad67139416c39cbe382e3aea587f06f65c9d41d48bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and embedded URLs are characteristic of malicious PDFs designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://yasairamenbar.com/uploads/files/71814106411.pdf
    • https://kuzeyilac.com/resimler/files/lofelipowelagev.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e93df8ca---37421337533.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a66f25ef3---sukinonuja.pdf
    • http://esistore.de/userfiles/file/lededijiz.pdf
    • http://archimax.ch/dynamic-images/cms/file/95073681913.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/7pn5jlpsgsnuk3ct9v9saofnmf/gagimavasifevut.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/0aa667dffa3ca1d8236508bf0859fc29/dininumologibobaw.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d8b49213dfa036daff37b7e82863de3f/guzojifisenegotujuvudixef.pdf
    • http://christopherdallo.com/file/jejukurebiziziwufabid.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a12b11bd4d005c26379dc14a588ac09c/17132961012.pdf
    • http://happysmilecard.com/uploads/files/91575651798.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607882185c907---75760222573.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/793510b5c2fb04649f27684147a99569/kuselizu.pdf
    • http://osteriadelcampanile.com/userfiles/files/lobatexeputuxeluniwa.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd6a6085c---44776495379.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/lonobawaxigitunu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pk75e174dv87iqv8lnq7hsspt5/tamigowonagasisofamux.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/79119408722.pdf
    • http://schokobrunnen.com/idata/muwavolot.pdf
    • http://ohappy.org/userData/board/file/20535310577.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b06af9219e---xalujedixezumowizibonube.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befc919f6ac---86457515180.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=missed+dose+of+prednisone+side+effects
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 16792 bytes
font_01_sfnt_off000102c8.bin
7cae8a34f2e6622ca7c992614dea1b88629ebd5ebf558579fbca97197d99e8b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 10400 bytes
font_02_sfnt_off00011a6f.bin
f35947f82f5600b5e21597da3fa9f7cb6e5162e37b6c24174bb0514526e0d73f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 16496 bytes