Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c67c88247c57212…

MALICIOUS

PDF

79.6 KB Created: 2021-06-26 17:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56ac7820806b1068d6d43fcb4afc3c9f SHA-1: 67afb98439d7fbd2e4f76dfc5a051532875f6891 SHA-256: 8c67c88247c57212c3f7cc334549045f1216c9e09a241afb2068b4b587936f17
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It functions as a link farm, containing numerous links pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, leveraging the 'Spearphishing Attachment' and 'Malicious Link' attack patterns.

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca37a380e---25557878482.pdf
    • https://amblamy.ee/upload/file/12565681839.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1079ca9c6d---27479053080.pdf
    • http://vandientuchinhhang.com/upload/files/84033487561.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/72dc22487813138f90fc03bc5e4955f5/sowijipufe.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf5728ca0---21567191808.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c0443794---19546735222.pdf
    • https://groupunsur1.com/contents//files/fuzeridamoxekevofati.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7971df7bd---veligegigigera.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5d5d402ecaab62f13295d6536b41988d/49866815098.pdf
    • https://accu-split.com/userfiles/files/fegelorilulixiwuxozoso.pdf
    • http://wtmongolia.com/materials/file/76841597741.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5km1sldl1516139qfnp4omt9dm/97983530214.pdf
    • https://businessservicesuk.com/userfiles/file/49280386053.pdf
    • https://louvre.lv/res/wysiwyg/file/nafatowegiju.pdf
    • http://usmleworkout.com/files/file/30311301167.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ff1e8a06---medanikufetodotuxiku.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1565da24fb3696356a5805377aa3d91a/xadedajufuxo.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ntune2m7fcvv7ra99gemi5qh32/44081801327.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/48a5a46b5a07e571fe7e847f4e5bb2a7/litezikuveligofizepis.pdf
    • http://studiotecniconuti.it/userfiles/files/21189182772.pdf
    • http://dwhs79.com/clients/15834/File/beduwusoxubugomati.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c99d364e---18398315747.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3a33419309f87435a938e76986834592/32744136826.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=directions+to+hard+rock+casino+atlantic+city
    • 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_off0000d49f.bin
99f28d9158f5db569a7bff83abe3edca8207a332306f7af2a95d076696b706df
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 10672 bytes
font_01_sfnt_off0000ed13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 16792 bytes
font_02_sfnt_off00010525.bin
f175a8c0740004b98479d94c67091ad75a0682f7914f9d2798bcbd2148226471
pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16720 bytes