Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f07bd428687f242…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 13:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3e08b7e87bf386251b9a06cd8d75e2a SHA-1: 1866b54eb634388896a650e7148702ce7870136a SHA-256: 7f07bd428687f2424db7e08021d086265a36fbfd59db1f7d446c4ef4cae484f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, many of which are flagged as unknown or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://efeotokiralama.com/Upload/file/54786793176.pdf In PDF document text
    • http://szakkepzosiklos.hu/upload/file/wemanis.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/14704339601.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/25859114227.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/siwopit.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/diwegukutapilazuje.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4fa460ba---66073516732.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vixajetadedizojelavoxid.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/pulaxapuga.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c4fb95842d0dfd6cab1f0f0eda90bd1c/77117777882.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/turarite.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c0deaa91fb3cb2c0fc4b35e7cf33317d/tanenadivuluduzelaw.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362f9eb2d0---31932818763.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/novakabopubir.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/34525855679.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///nawurepekifijux.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5sqj5nifquugqbo1ukuf56ue59/76170046567.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/radebekipulapi.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/8392755154.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/36717849584.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/lumopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bergey%27s+manual+of+systematic+bacteriology+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_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 18584 bytes
SHA-256: c6e422cc3fb03f26cdb745d06c6327868770f605af26e2beef45d3f319f572f3
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 11404 bytes
SHA-256: ed9fac465c9d1496dc44a818f16087713ac9d8aaec91f1418c178f32b0223b8f
font_02_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1