Malicious PDF — malware analysis report

Static analysis result for SHA-256 688a56b6b06f778b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 20:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23c53fda63cdaeede994c4ceb46bc85f SHA-1: ce11513dea3d74dd56c02cb1a541b731850ad2a9 SHA-256: 688a56b6b06f778b758f19428518c4c5d9d7f05e91c7efc229bb9d38bef8df41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, directing users to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to manipulate search engine results or direct users to phishing content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ptogel2.com/contents//files/4332847317.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8aaf3cb2f---puladon.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6c1ce33c---runavomi.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f145faf62dd7d56809458a7f46feb6fc/65176288318.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e6e00114---87120179054.pdf
    • http://art-lan.ru/uploads/assets/file/kagedutufedokosix.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/178hn3m2ju6hkjr21r8kr56naf/fasokasopaseroper.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/80imav5gud5np38patrgo9spag/42445259005.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/v10qae8eh2ujbf06r0mjtron56/lexomixuzonovugez.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d0aa753f3f4257d2bbf26559ae9965ae/29499074472.pdf
    • https://arerp.kr/data/file///90330532802.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f4f9658749e6c1d2d36d3ab59f52b8b6/geselubopinom.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4bf0e9c60c662c552e021e996f39ad20/50970695108.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f834a40383b1863e978e8bd4ec3f231c/51561012981.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//56893707191.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21848a7a0d---29033457018.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160705274b3c40---mifowomibuvadedojozu.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/47627525386.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082043ccb074---febiro.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7d5d10e2c9ce7e86388ac801ac44a71a/pobigasakuxejodow.pdf
    • http://solartgaleria.hu/images/file/2524931165.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9684890c16580238084921d09715e9a4/78922884050.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=plant+maintenance+test+questions+and+answers
    • 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_off0000eba9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 16792 bytes
font_01_sfnt_off000103c0.bin
869381098d2678ab842df4eb093101a034e4ec72999c9545ef505e3e761d643d
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 10864 bytes
font_02_sfnt_off00011cad.bin
50dbef885d0b498de9aa121a98c80bf3bda509d8b5d47878348ea00623cb15b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 18820 bytes