Malicious PDF — malware analysis report

Static analysis result for SHA-256 5488606edf28be87…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 00:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94401b8cc5a369283581f48ab0adee2d SHA-1: c6e7d4f7ab70b50dfd1f82251623cc211a0173f7 SHA-256: 5488606edf28be87d2b626f1c5026f2326ee839e6767369a1f4226c508071049
184 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF contains embedded JavaScript and a link farm pointing to potentially compromised domains, suggesting an attempt to exploit vulnerabilities or redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' strongly indicates a callback phishing or tech-support scam pretext, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dishandspoonproductions.com/ckfinder/userfiles/files/motizot.pdf In PDF document text
    • http://gianniarnaudo.com/userfiles/files/80577066910.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/juxepeniwab.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/gokuxutitamu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab58845aa---58463572505.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/folurewefabo.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/zaloga.pdfIn PDF document text
    • http://gro-felix.si/uploads/50631951376.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/bozoxezukuvasaxo.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/72620305572.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/81479782668.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/54201301462.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce278ad773---vibobemalomitagozizos.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/25669205074.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/28949096739.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb6525fc7---53983337862.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631958765.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/65313055619.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81988145557.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0085e092019a4aee4513f4d885aee538/91451389026.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/34046233015.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/39676372131.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/mekeb.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac67d05f2---12159273001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+turn+off+smart+call+blockerPDF 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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 18008 bytes
SHA-256: a56fa42a4612053c1330e4c94f811b39ab27a13ed08da53585ca7a1cd533be39
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 11048 bytes
SHA-256: 74d66fdb4135106cdc71db0d540410cf92513278c1ca1fea62aa78d880607060
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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