Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1e49d670fdc707…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 03:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a66072ff700e4ee87937c6bd6e4e20da SHA-1: 99be0e19fb70d0a2c0fb00477e27f33ec48d2ea0 SHA-256: ed1e49d670fdc7071894431d1885226fc25cbb64be650cfe51744d9344c5c537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI links and the compromised CMS upload links indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=engineering+pdf+notes
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608af39ea6609---pedunakafefefikuxupofezi.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7fca39a53---1788319892.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pd3e8dhombroao9c7ltfgeqg7e/40631139431.pdf
    • http://emailreceptionist.net/userfiles/file/15275196316.pdf
    • https://vinaconexmec.vn/uploads/news_file/55542464911.pdf
    • https://fajanav.com/aym_image/files/gorivojefuvixok.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210702092209.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/m3aj41d01uvvip6etmo2mmh14u/44981808429.pdf
    • https://dcmheavyequipment.com/admin/images/file/97637450810.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f2304a75---33587193727.pdf
    • https://cortemadera.com/wysiwygfiles/file/93552895720.pdf
    • https://fultoys.com/userfiles/61842519564.pdf
    • http://eviljoy.com/UserFiles/File/nipawugaj.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jeralkhi1tvck8tvuddii4iv47/74733100444.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/56079622644.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb6150f5ea---zezarixaraduvazusikoxux.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/5dbbb3c881bb3897ca55c76a585072eb/dakupod.pdf
    • http://chonburi33.com/userfiles/file/lazemokalire.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/5197918817.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a5d8c62c---nemafisodasomelono.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6198a0b4a---palejofanupinozib.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f0ec41a7ef5b3eccc89574b61f77fe2e/99681703606.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/da70a7e156c8ae44908a7bc79cede60f/84320611603.pdf
    • http://reicar.dk/userfiles/file/pigipijidisir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 16792 bytes
font_01_sfnt_off0000df12.bin
3eed6e8495909ab5e7382017bc63e81e3a04a7e4f188805898e2a6b5a66ebf42
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 10448 bytes
font_02_sfnt_off0000f69d.bin
85c42a8f25fce93b838c1c48095cb949e674462ed73eaae53743f1e1c8a388dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 15872 bytes