Malicious PDF — malware analysis report

Static analysis result for SHA-256 600bd4e63976f02b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-30 18:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f55bfe8b1c90a23dc451dc9c66ac399 SHA-1: 9ff089655fdc15af1085e55bbf8553f19eeb797b SHA-256: 600bd4e63976f02b21342ffab7509d937d410c945b578bd1a7bc3159862b3057
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=paw+patrol+online+full+episodes PDF link annotation
    • http://kammed.com/userfiles/file/xeralaziniwo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/bc8291ec4717edb4b076ff60bbb7f507/zagidevivifazanug.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161398cbb10aff---32395803821.pdfIn PDF document text
    • http://runhouchem.com/upload/files/genivamunufat.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/61786040531.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/daec78d6172b8590b661c2bcfff297ad/91508427854.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615212afea82c---vozepilibabozovotujebalew.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/26432983518.pdfIn PDF document text
    • http://bresky.cz/res/file/49978488426.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/zefogapozibuxozi.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/xokivesekanene.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/83497182149.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1f844503---vojojekabudiwizololimuna.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/70868513695.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/7684602869.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/fenosebabatisu.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xukigidutopajavulafapa.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/59297440320.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/jeruneziviradunu.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/72195925216.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/95220953185.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/cto2ii45ej0r6ghc7mvvf1iha5/rawuzinawusotaposiz.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/bozigovavilewewinopite.pdfIn PDF document text
    • http://cncsprings.com/d/files/19445786818.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_off0000b9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 10676 bytes
SHA-256: 58538e309d4d0818aae354eaf7296d45f7e169e279e6e171e82bc97bc82afccb
font_02_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 18508 bytes
SHA-256: 7b07bbea1d0c05f6d966c5f1af129218a958c4846372c40d1ee7ee3d91522d38

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