Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde889642a3e9b28…

MALICIOUS

PDF

71.8 KB Created: 2021-09-22 11:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e929d21a9f8603b5f8faf7a3a45b74df SHA-1: bc95976755beec8e6bee8d6441e32454abddd21c SHA-256: fde889642a3e9b288e65494743c10c3d7ba819b410fdd35b20d9cc554483fab7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. No scripts were extracted, but the presence of numerous URLs suggests the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131caa4509ec---11138192342.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///14048267292.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109032126301602.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/60514295262.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/18998235422.pdfIn PDF document text
    • http://pi-consulting.ch/download/4891707156.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e57db5a679025d2a4b97bcdc7bcc8f56/fugodunasaviduwuzovekaku.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/penonitibidobojum.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/zesuvobavonibedewofutasev.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fe2ad9f92339834b60ee83d0bf91fc6e/29374877211.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/veboramejixedo.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/12154812518.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/1161599010.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/simepixiwaxej.pdfIn PDF document text
    • http://air-con.ru/upload/files/53965608236.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/jadivit.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/3549877985.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/raneg.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/zafatiduwunenunojesas.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/sujewodinapakabota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=algorithms+made+easy+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB667 10936 bytes
SHA-256: 6f86d11089a5c0fe746ffa38a4ad26076b2b6967612b09b185911e082feec1b5
font_01_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 16400 bytes
SHA-256: b60010b58532205113bd8cbe11655d3b3b63640caa2a6e0c51538d081854d98c
font_02_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1