Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0d325991f140d0…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 12:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae17f1f64f646b318de62bb6f16b423a SHA-1: 7a6561ea1579f0e6f0800dc5af3235d1acc2e212 SHA-256: 9c0d325991f140d08ca22d01ae544b067aac6664eae867fad8677725eed489c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised websites, many of which host other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an effort to obscure the ultimate destination or evade detection. The presence of these link farms and compromised CMS uploads points towards a campaign distributing malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=ebara+pump+fsa+pdf PDF link annotation
    • http://www.europesolidaire.eu/userfiles/files/75331258040.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e06f2440181df2d426e761cd402e5d34/33697149028.pdfIn PDF document text
    • http://plncse.hu/php_data/file/67543070204.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c872ddafd8---gebiguduxasaderemuji.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4fa460ba---66073516732.pdfIn PDF document text
    • http://e-district.org/userfiles/file/52546817970.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/evt0ggl3422cc7de7hurv5eo9f/35583548546.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2d6f607b5be32ded6e259d03c5b4e8e4/jomojotufopusulubifebu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/zomobirupifosinakikasobil.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c319d427220---juwuteju.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/poriko.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/67116623362.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/99964494026.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/520f067b3b07f721488cb27d2d130bb2/38166963045.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/92b285e5e0cfc2c2d5ac98375cdb5bdc/93513764966.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7prhk95squ0fn6o7vth5p4je52/51426347810.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/24275481619.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/54555369382.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vizixefoxugoxuva.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/11343775826.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///64797871871.pdfIn PDF document text
    • https://jotelek.hu/files/file/jemab.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/60547451170.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB19 10292 bytes
SHA-256: 51a9667d7cb2f647d6a33309dc1ba3b8eb8ca565b23c6e63e78a134efcbab9af
font_01_sfnt_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 21356 bytes
SHA-256: 92671cd170cad0d5b8f92626309b09de1668e808f72ee175e4109cbd50995253