Malicious PDF — malware analysis report

Static analysis result for SHA-256 9870edf6dcbadd63…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 10:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac5a120673ac5458211276cafe2ba70f SHA-1: fb369765f3a3f6ae4f3f8997e1517a22997cf50e SHA-256: 9870edf6dcbadd63de15c90fbbcbe949d9fbb6e6197670e7c81fe7681427754b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a secondary payload. The heuristic 'SE_CALLBACK_LURE' further suggests a phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=okidata+c711+parts+manual PDF link annotation
    • https://investmentskillsgroup.com/images/userfiles/file/24513757485.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pivesazekanamiwi.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/18989005829.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24321d517b---wepopa.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5023b936ca---78451281874.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/39e569b4bb92785310e72f3fdf3558ae/nitagijojawirodugupevipo.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/73654477421.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c5656e54635ccecdda9bd9d8cc691995/dizoson.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/1758951633.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/96382982022.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/zuvuvomujimikoxuxal.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/32710502827.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/64814842566.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/vabajikevitamelirop.pdfIn PDF document text
    • https://fratellifurloni.it/file/256735671.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/50408157381.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/vexomupuxamuzozibixami.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba99cae5a---32677571050.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/623a76031405f31ff21fc3b00e643b8c/vovimedor.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef851fb31---41868456238.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///68344690027.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/gidodewu.pdfIn PDF document text
    • 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 17312 bytes
SHA-256: 07ad3bb963117f3f7f581652733012b1bd3dded45669201f5093367ecd4ab40c
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 10744 bytes
SHA-256: b6a9a17d4d9967c1b3e5d13af37b90e3b145e967c9ed2409febee3bbd0a0dc77

Open this report in the interactive analyzer, or submit your own file for analysis.