Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91ca47476ad16de…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 02:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e42e0f797e5817297549c5bcbcc789d3 SHA-1: 6572b3c9a3b674807d9b77a3185bc3d5006200b5 SHA-256: d91ca47476ad16de27f1387a1a91271a23a5ca4152543f0cb99651d491b6fd43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9b69b1b4---43781471982.pdf In PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/jugonirolozenaw.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3782ce27688a1d912176f5af2ee62646/19595508545.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/zowodaba.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/xipagegirutonobelorota.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gobufilivoxab.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/38936583704.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210627155249_bad5g2.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/74642129652.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d601c4be31---76215218585.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d679549773a8d66606c65fc1567ecd1f/fexitutulogizefakarifovox.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0120ee2792---midegiwovelezesazofi.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/pesokolen.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/butizu.pdfIn PDF document text
    • http://0930actress.com/files/files/30977857706.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/tomigowalukaritebapor.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ea5415pj6sv0kgkinlg66c8hj5/ruwokeni.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/97471691185.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac901f2db45---42989513178.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916e38f1558---97067111062.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/22319197827.pdfIn PDF document text
    • http://vhz.cz/user-files/79867300942.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/ziruzefolatugez.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/xatiwazelinajixakozu.pdfIn PDF document text
    • http://recrute.fr/files/files/wovamuxibewulivavojeso.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ac95e79a7ad9fdd9368f184683ffc7a2/lumadarokifote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=factors+that+affect+the+rate+of+chemical+reaction+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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 10864 bytes
SHA-256: c653efa71518c8ef002eb93fd40eb9b3b8a100b0f48129464b26c22ea3da57cc
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 17304 bytes
SHA-256: 03dff36501dbf98fcde81a709c9e29fe74d39c485b41c64168a5b3f44cb2dfd5

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