Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa0941fc94959e5…

MALICIOUS

PDF

92.3 KB Created: 2021-06-30 16:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f0c65b25c4dab0e71f460504e5d545f SHA-1: dd0093acf05afaeea586257e142a786057fbf9bf SHA-256: 7fa0941fc94959e5a2ed5f3258c9a56698ec0c56f677a012b818211ca49ba9d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://bistakalikotenetwork.com/userfiles/file/16195039990.pdf In PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/79665890247.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/918a111ae1c7bc31b4711b67c0445ec8/lawogubelinet.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ece493406845924396caba3c43328df0/jimupesazosotobixibi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qlt0j3pn9naa9nq86nb1jrdvtj/68930177820.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/88547640076.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/02141fb62d721b2292004b73be604740/wakeda.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2ae7ee57a9ad85acc5f3dce4f831b251/kodubawisibusug.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/tokasesutesevavos.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/26182686950.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/wamezukekojutafiku.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8bce9e1efb8f417df232a418a17e820b/50476764828.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098621539e32---71875530079.pdfIn PDF document text
    • http://omg.su/upload/File/nudubo.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/62cb7f32f0ba5c04222de423ee4272a7/lalugovo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfdc82c5c---zovejubijed.pdfIn PDF document text
    • http://www.toptehnik.si/images/worogunuruvetababebo.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/19984838237.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160822df452d4b---zabap.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210517212720_v3ttzn.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9ec51257---galikelixakedutib.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36b7e08bb---keteluzabapemisiganegeg.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086a426da66e---geniwutuvofalesiroraw.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3m5ngv7ht11fsflh6iu7opqjrv/duzosowodumudipatu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b801cf7f4a6---40567261849.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/97219085667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mixed+reported+speech+2PDF 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_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 17928 bytes
SHA-256: 3fc640fb2a3a825e922a09c359cf41ffd037687ef1d6d29d2687660bd9fd4d8b
font_02_sfnt_off00014b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B98 10512 bytes
SHA-256: e00888f3755e9acfd2bfafb8b3e7f35aaf0f80f4e34fb32de709c046f88dc1ca