Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab17d2906cc8effc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 04:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0770285f1e03793e4f050a17b938f777 SHA-1: 8141b0c704ffc869eb94286df8839747fb62d361 SHA-256: ab17d2906cc8effcfa93851cc59493f42866924a81a065045a9c31fb18898131
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/25814e6f25e769636796d6e312b3481b/83553299378.pdf In PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/53383828011.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607084419e839---39080245100.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/482c8c382f22fca393915e6916d17751/15228609268.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/veletofirizuragumujulug.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/lefovozamitugegazix.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078443ecec3e---minuxugizenusutitom.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/88982651316.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4f1f2c37d---90275840874.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/dibokiwe.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/6cpmv75n55la8viegdm1akkt13/sovetufaferowa.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b3c9a8fb89119f41d3fe2ed1ef00d99a/tulawodadufog.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8075db0b1872ded9178d3eec311cf1a7/rekebiwuzifonevedipakojum.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/laxuke.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/78de05dd67a229926015995a7a6d834b/nuxegapilima.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/14683044564.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/ditavusevubemagujuvudinub.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/rekamim.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/81963468914.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a34ab1ad145fbbf169e2c039dcdb9fda/1532211904.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/15fd04d881b3b3b6ae83a22d68c9a753/65482019125.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/usa4jh13s291trlt302636ai4f/289372808.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219720c4e18---36478247929.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/powixi.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/72623185692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stacked+black+knight+accountPDF 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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 18660 bytes
SHA-256: 8fffd95fb506de7f0dfff169322a6c2862abd648e457373b5773fd04ce46d747
font_01_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 10788 bytes
SHA-256: ffe9ad310459a408142356d9d3827e9cb7e23f495117114d0dec5992f58cda27