Malicious PDF — malware analysis report

Static analysis result for SHA-256 910b738a26d3a269…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 05:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 59d41f41dd3f588d510612fc92db2c6c SHA-1: 1d58484c3571df6da3c729452dde4215f7869bd0 SHA-256: 910b738a26d3a269039404cace2a2ba040ae092b2dbd7509a6cb9ac3d1a81caa
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS platforms or disposable hosting. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://editionsitaliques.com/userfiles/file/76632469449.pdf In PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/48739893844.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vm2pbrvhhoj56d1rv98bpt8a9a/265114161.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kusikepopu.pdfIn PDF document text
    • http://vhktn.at/images/content/files/52343324591.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/56248739652.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/fomulavedubufigezo.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/50413212351.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/sikesodusizi.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/27495156115.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614444182e57b---77700768700.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce4036eca---jotarifevuganudovawenu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903093050.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/nonelunogelejotet.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/9515833864.pdfIn PDF document text
    • http://kesifveotesi.com/files/50209951357.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/nematobeveb.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/36649428881.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/97150529294.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/94052012954.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/12159283977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+language+settingsPDF 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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 15112 bytes
SHA-256: 4fcaf25c402c4e192252fc71b7176ea48b66a7282116d9bed4d1e530a1a96bda
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10504 bytes
SHA-256: 5fd740a59a9a83241e8c4ea398639e0df6ea3f4fc8c037b1d019cfb08e28eb2b