Malicious PDF — malware analysis report

Static analysis result for SHA-256 e155bc75ab850143…

MALICIOUS

PDF

81.0 KB Created: 2021-07-02 15:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 681c54993f1c79fd3fdf0b3513738188 SHA-1: 9e3da86df2ae23693b71bfcc49386f8005aac17a SHA-256: e155bc75ab85014327c5bb2965982dc5d462d0bc0629b57b9f2a5f6383f5418d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, presenting multiple URLs hosted on compromised websites, likely to trick users into downloading further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or social engineering attack vector, potentially leading to the execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://zionapostolicministries.org/uploads/file/55881634180.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736874bdac6---dimogaxe.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/0a4dee08e78634340e708ef7eb83f808/47342094863.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d7b845a8aa0e850c993a7fe03ae17e69/bugokijufiton.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/najinutetosafewaraj.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f04bd66f337f43dbcc5cdb2c798b4f83/guzazakumawit.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083688ba8dd8---ronuvowelaf.pdf
    • http://jrmhandling.nl/upload/file/jivalinonul.pdf
    • https://educhina.mn/editor/files/saxob.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c6204998fd7---74381102754.pdf
    • http://lawrence-spruill.com/clients/42275/File/juwasalitomile.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791695533f1---vowimetilojufop.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608affd897aed---kitipozifo.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8a29ba8085a2ebf2c5ca8855d1eee2b4/72208804217.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16083b35c84492---64716628388.pdf
    • https://thisissati.com/userfiles/files/10396706037.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716a60b38f1---53854253615.pdf
    • http://candemdientu.com/Images_upload/files/43164108583.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160722626066b3---vuxebegekeziwetezavemu.pdf
    • http://lapenya.cat/imgjovesnaves/file/labede.pdf
    • http://aire-limpio.com/img/editor/file/wozitevu.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/q01fo0gs3fhefjncd2mgk0jcnr/durosonamumaf.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429033607533931.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ede47af3---supijukoporokimaxe.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a03bb433---levodomejojijasinom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=umn+download+microsoft+office
    • 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_off0000d904.bin
62a81997589e46ae31da483426869acc2be77deb03a6c6f7d361830565726666
pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10728 bytes
font_01_sfnt_off0000f1a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 16792 bytes
font_02_sfnt_off000109bb.bin
706f08429823f979a5dedd5408c5d849a88bd173ccf80bb3ae1382c8afffed8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 17144 bytes