Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c39a2780e9af40…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 06:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24f2dcddc2a843ccfa889454feaff52a SHA-1: f5e1ce5361765769ed159365adb5a235b4e3022d SHA-256: 06c39a2780e9af40d285343d1ce7a04ef8c59eb0f3578dee4a916a71f24613ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which appear to be compromised or disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://demkapi.com/resimler/files/potamavegutasenos.pdf In PDF document text
    • http://industrialdevices.in/uploads/ferixomukosidafoj.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/87217829869.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8cbaf5bc682d939c8e0efccaf70d2ca9/bokofe.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/satagamakagoxo.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/97841013624.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/xegadivafopopumezudeduve.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/69238210650.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/susaruvuzizi.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/55963562920.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/1919109226.pdfIn PDF document text
    • http://lulanjina.net/upload/files/neruxow.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/44388303393.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/jejuv.pdfIn PDF document text
    • http://rurisnet.org/images/file/vozav.pdfIn PDF document text
    • https://telorgabus.com/contents/files/44946019991.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/53326733594.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3bd9d20c---23364025919.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133807188cf0---4934859286.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/94485306053.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/53369211868.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/11889954313.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/86975570689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=application+rotation+video+androidPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 10384 bytes
SHA-256: ba96faef59f7442d1c6b892b8ff18c34c0a8d8ae913c7b3fd27991221808705b
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16844 bytes
SHA-256: 14e2e778d28a0f31f85c781596cfbc46f68718f0644da3de5237d5134fd22213
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1