Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff209128c8eafa6b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 18:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f9346b72577bab441791d57ca4cf628 SHA-1: 8063fe715d1368a1133252dfb355dc2252be3747 SHA-256: ff209128c8eafa6b187b92bbd4499c887fdc4ceebf683f3ea085a1142d7ffd01
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=webasto+heater+repair+service+manual PDF link annotation
    • https://atcotourismtravel.com/userfiles/file/megalolerekidojulupij.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/takadozadotirigitiz.pdfIn PDF document text
    • http://ipublicity.cz/data/file/55827912348.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9379051b---23816886483.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/bonisavegirenimegives.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e053617514---83474523287.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/40552410663.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/duzanaxabebe.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/57738684571.pdfIn PDF document text
    • http://hibertek.com/image/files/20210729_074749.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3368daac2c---pokabajuditasokinideviged.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/xupalirumefitakabuwu.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/4210903233.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffff665cff---84311769641.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/29478446578.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609483ed7dcb2---97122456232.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd10b3408---najubevarazuzuzizire.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/72808388268.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/24987536128.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c55fdb6c7---81737265028.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9c0db69aad9b68e97b977b78b2a09ee2/busakufidanidadiko.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613213ecf1a89---14492678055.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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 10936 bytes
SHA-256: cee6ba47eca4e1983a6626310131109bfcd4a95c2875c4b6e84a31e8256216ec
font_01_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 16716 bytes
SHA-256: c54fe9afb2b73f1648974ba66773633ed51f783d39e8145eceaf6676337e5dd3
font_02_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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