Malicious PDF — malware analysis report

Static analysis result for SHA-256 920c134ab7d91043…

MALICIOUS

PDF

88.7 KB Created: 2021-07-26 14:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 784c783e54a91087d9aa38d8287f1e58 SHA-1: 2fa465094c99f66c5d1b4b8eaa900b03655ddcdc SHA-256: 920c134ab7d91043362b39c3cb3676471446b4adf92d729b53f749bb5fe7a427
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8478

Heuristics 5

  • 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
  • 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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/286f84dd90742af02fddd934fd793eda/gevevanini.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1d505046---tiguzudumanesomi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g4h3k9ovpd5q5arkd6qen9fv21/kikifekanimekitivifor.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4708fdb25b---38288358419.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/57507552272.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/66642286172.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/16924472590.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec7fac2fb---8954613575.pdfIn PDF document text
    • https://asiahijau.com/contents//files/fetoguzabun.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fb24935edd3---33634438880.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee56282061---puzikitivalugiruves.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb88380fa9---sagimu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf27b3323ebe798f4b96492da6a4577d/11996907120.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ab933373---54036908082.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9b5d2101---74704957239.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/85027116745.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4693e1522---fuwogifarujufav.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc6a346ea---38536249038.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f79df9213005e71fcddcb1981365cc3a/72601769506.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/donovixisoluvogibetuwi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/latifesijujas.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/46879873630.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kobaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=traducir+libros+pdf+gratisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 10760 bytes
SHA-256: bdc4ce9c1f670f986ceae416721bbe9c989ef207f9c3562d1aa328421b8450bf
font_01_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 18124 bytes
SHA-256: d745504d2202acfa07d2d3491c1f3bfd74eca9b77d4578dbcd69b9fac6af120f