Malicious PDF — malware analysis report

Static analysis result for SHA-256 8747e07041ed4f28…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 22:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79c123532fb51e8b80f457a2a8bd9f1e SHA-1: 6e7b4e7bec528209527b551189063eda1fd3f84b SHA-256: 8747e07041ed4f2875af265fa1fdf06fe83e01c857240aed10570a266286619a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a link farm designed to direct users to potentially harmful content.

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://medvor.ru/uplcv?utm_term=bidirectional+visitor+counter+pdf PDF link annotation
    • http://worldnaturalfood.com/image/upload/File/soditomebis.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/muwitaxixidujubixuzaletit.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/76351744666.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/zapalib.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a91a4ad7ce1af7d988154cc8a8384f99/bivivuzabukuxab.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3cf4da88283f997ea8389a0ca8e1bf1e/xebunoxudosavopowobet.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/67921170560.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lirofozotidipejeta.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ahjk5e433108l1a3epu3qa03s7/resaketeki.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/zudojilevutolowe.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed13a19e4---3474905941.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mldiis2ece0qibdb234793fg2u/jiwinawezefizasarebadip.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff39cc6e96---xowixasepitozukikatadem.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c95db1dd628---pafabogedozulegawesalivef.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/47508530903.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20218281053558203.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959d3c0a2d4---duputazi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/95345607923.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcbc5d270fb357d73984037cd9a3d58a/jojagi.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/46656796771.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/53b240383cd52f0efdba0c3ac46d6d16/safexixi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078c6d2a20a---mofikugijoxepawukoket.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_off0000b31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 10832 bytes
SHA-256: 2ae7b0f7317f6016abb255dc285a3ce42b8a1ec806dbbddd01b01b370aa1cb64
font_02_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 16288 bytes
SHA-256: 43414ecf854248d20d546190c5f2d3eb5d59d98e06dd5390ba10e384312eeb07

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