Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e0307ca814a69f…

MALICIOUS

PDF

98.4 KB Created: 2021-06-17 13:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79cbd37cf42c9c7a421068516422cc1f SHA-1: a6617081860e9f199f708e1e05159bd48daa5951 SHA-256: 86e0307ca814a69feffbd840c275fd7838809026e86baf36ccb914eb516d66ad
164 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as Pdf.Phishing.Trojan. The PDF contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button lure further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6936c4238---36255979477.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/tisolozikoxob.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pisogu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f9baec3fd6e419a18530d91a992e1bae/62418439934.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec7d0ced7---255971256.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/77455369d2fc90bd4d6c57826f16ffac/kujozisim.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/76477087201.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/35524069716.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/10606264169.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d946ccec---485503692.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/63451664385.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/75933452791.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/vaxafotobava.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/niwepola.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5398ac922---bitokunoximufutopa.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071ded863ee7---486808570.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ddd1fde4605f5f4288a952a71df9b80/26205549691.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vceba1icv09htom2pegfvse0kh/14904116767.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/4753292636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=korean+phrases+pdf+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16712 bytes
SHA-256: d33d5dbaaca2edb1f76b8a6641528bdb1ce4090df0a4a39d2a44f9bbc306b885
font_01_sfnt_off00014430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14430 5188 bytes
SHA-256: 206d85fa93fe0f2b8869c29f882a80fd0be81ffc17d84e17ce54ce1e638e2c90
font_02_sfnt_off000155e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E8 11232 bytes
SHA-256: bd395845be59b2f767d69aed2d0479e2b96c6c2552b15411c28edba0bb0cea2c