Malicious PDF — malware analysis report

Static analysis result for SHA-256 15573fe767dd7df7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 10:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89648a35d9c08464588f939b1f865342 SHA-1: 2338a4b2351ef80237cefeeddca9a443ad5ea3e7 SHA-256: 15573fe767dd7df7fedc0ad21620d970e4f1e308c351221fed8f8c3c9648783f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'Callback phishing phone lure' heuristic further suggests a social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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.
  • 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://doosradashak.in/ci/userfiles/files/90989576950.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/cvvccbueghfk2e42qjvufojmo0/jetiluwomoladufeweva.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/511f9c2b4ca8d2b4857194be0d45983d/14175710541.pdfIn PDF document text
    • http://snft.ro/media/file/28780950978.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/puwigonubaw.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/kujij.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcfc2f56e---19419384815.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/labegeme.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4c33ff8d---68077970434.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dufama.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1293773116.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/fopuma.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/79436677616.pdfIn PDF document text
    • http://www.moyekolodin.com/files/1155117212.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081618bdea11---popisozanuxomonapalixevel.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2grij5a0so31njjv05s70vv6rd/dupibalaxedel.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/74140548019.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/wamogevogunuzavenu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/benumugisixedam.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6b0098f5eee8975c95ccf0bcda669dc5/vudewexagoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+check+ps4+download+progress+on+phonePDF 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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 17768 bytes
SHA-256: 07399c48d659635309562d96091a42355976911fafd0c2cbed3a701d39c79f48
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 10948 bytes
SHA-256: ebc600785b58ab5b215c5b9d5cd47cc9fdf7021bd5794f8440715993d1412653

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