Malicious PDF — malware analysis report

Static analysis result for SHA-256 a418db1e4b9ae10e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 01:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63a81c65743bcc4870e4fb8752c188b3 SHA-1: 9ea7fa6c617b9279aed34df396055e089dee8f6e SHA-256: a418db1e4b9ae10e1a2e6c3fa120c0da40cfcbdc5ec344955d8d7c647a833e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=weight+watchers+cookbook+free+download+pdf PDF link annotation
    • https://gemwares.com/userfiles/file/96637170735.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada15f9e30e---vofilewafurisineviri.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c3dceb86---78071791041.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/mizegebiti.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/subizovujubi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d7395c22edfe5ac28c1236269797a8bf/91785122048.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/53508425288.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/65bd8af3a661e7b00fe82709abe46c36/14176107818.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9989304a42e1dbc6ed19211dfe337b47/suvexuditiwubiv.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/53230794704.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cf681b21---33442522980.pdfIn PDF document text
    • http://texmet.pl/userimages/file/26874013642.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210825234615.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f9d44540---dufexarifelig.pdfIn PDF document text
    • https://beliangka.com/contents//files/35008456624.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e7aee9ce7c30a17eb15d4d53660d780b/71410266882.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/joledisaduma.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/52020777854.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/50351741674.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1149abb87d2ca0bd94dbb10fd11e43df/59895612222.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7bbbce082a2cdb7e5eb4914ea23619c1/4116155990.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/80376866042.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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 11208 bytes
SHA-256: ad5c36fa4bc957d7cee2164800324fe950b676638ba7222776c6f02335c9022a
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 15448 bytes
SHA-256: d6145e9bd8e782eadf49157bfff6ec836f52e69108a9031786c6b48b91375257
font_02_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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