Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21c8278872b62bc…

MALICIOUS

PDF

82.7 KB Created: 2021-07-15 20:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6ccdb4ceab41ba0c7f168318b3abe3d SHA-1: 73f61eecbf854e3721138fa770a6cd4c7a7a4e08 SHA-256: a21c8278872b62bcb81644798e2d5f585c83192b110d3a7f89bf885cd1039507
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to phishing or malware distribution sites, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/552df1a4a2c8a6421c23154d263b038e/91913309874.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/41mfn5r7t1n81hqpvttdpv7uih/dunutuzejupobezutuxugora.pdfIn PDF document text
    • https://kham.vn/userfiles/file/51375354695.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/fokufiwa.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/62948876461.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/14/tatobifivimazizi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1skcgdd1v5gn4pvlajhdi8g5kv/bogemixofigirojab.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e7a86ea33bf164c62165fb026f8b7c44/39679039087.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/joxawepemetowakafu.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fesitamuxijiguwubi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160844b59d5fc5---17445354818.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ad084f88617443a1788e4371484b8c90/tozejofaxenuraw.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624863095_06330b3475.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/70ade546ce8873fc3b61a5214b04979a/29127945755.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7935f134---watuxafesebixovolo.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/48946406997.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/46003438499.pdfIn PDF document text
    • http://championsview.net/userimages/difamefixuzoxumek.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4eb8433dadf9b5c096cde254b145f8a3/linepasilotanuzu.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/50516653345.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/juwapuzulaxumebasok.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd63251c1f---49768000858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+gorgerPDF link annotation
    • https://lapdonline.org/file/rafagulokusapuzob.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 10068 bytes
SHA-256: ed586cfd0e8bde9eaa5b4a693f21388f99c63856a2f61b7951437dabdb5b373d
font_02_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 2480 bytes
SHA-256: 0d45c151a473106f3c63353c2a899e825be678e673d62bdbf2d792cb97d9a141
font_03_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 18944 bytes
SHA-256: 4ef4776af1719b7d20439b2fab66b04c3cc32a4e4e9ebf453ac1f57b61efab15

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