Malicious PDF — malware analysis report

Static analysis result for SHA-256 597dabad8a65ef22…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 08:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dff1bd93e568ffffcbe9960b3e1c0849 SHA-1: 03475f8b634707dea3c3a727f5985b14e7c06ac6 SHA-256: 597dabad8a65ef224d0bc561934733f0a433db964047bc1b8b46b04ab1c94967
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the document as a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=the+road+to+good+intentions', likely serve as lures for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=the+road+to+good+intentions
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608244d5832c5---febotekidopasogo.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/92fd27e797ef2a0f2bb33c1b6cea6526/6191252569.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/65fb387971e09c079ab97083fa53692e/59384095061.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8e01ece1e0ac18dc59646c90b2024f9d/vogefufufatusibezujumewul.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b4f93acb---99365143383.pdf
    • https://ferado.vn/userfiles/file/86751219529.pdf
    • http://maility.pl/_ADRESuserfiles/file/wapobawiwoverojikapunufut.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa0adca87---bexusakasij.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc128c9533---72650304945.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f61194e2---9360411733.pdf
    • http://ristorantebiscione.com/userfiles/files/wojofagovunakegozatof.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e322kaa9hov45ch4k1evmpb5n3/65155174738.pdf
    • https://adreshosting.com/calisma2/files/uploads/gilalajopixewakibapimu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8494fd9919d450c2ccae350bf0778573/79469405519.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3254d150ff---lixuzetirafobuloxel.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5790acb7279ac11edc08f5e255a62e8d/134641302.pdf
    • https://viessmannboilers.ca/fck_upload/file/92174796495.pdf
    • http://fantalife.nl/userfiles/file/41331142862.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b75b170a95b---18770596792.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cee8c45b7a7---jubasajepi.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b79b3ab5---xufeviwetufodopasijurezup.pdf
    • http://afghansolar.com/userfiles/file/lekamurubej.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/xetudevopidimo.pdf
    • http://elesi.eu/fichiers/files/66403862581.pdf
    • https://stbenedikt.ch/userfiles/files/62632370532.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 16792 bytes
font_01_sfnt_off000106ab.bin
b909b3c16639dd568f41d4053ba5bb7d10792475dae396068db8405ceacc52a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 17280 bytes
font_02_sfnt_off00013383.bin
e17cdd658ab6f1f5c5a58e6220a2d63cab9d42ee2cf0f5ecfa856492ffca411d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 10444 bytes