Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f44b33cd7286035…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 10:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 359f41b4f122f81c53366d8ea2b01d27 SHA-1: 5a0c349afb72be195172f75478e13e697f916a74 SHA-256: 9f44b33cd72860354581480c6ddc902ff325d6be5a0df90be8b419a0b6a09a0b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The presence of numerous external URIs, including those on compromised CMS uploads and disposable hosting, suggests it functions as a link farm. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=bodyweight+programs+pdf PDF link annotation
    • http://1careglobal.com/upload/files/funudukamelul.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g2u5qsk68lpfr0p272p0mut6b6/75999262409.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/19682963764.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/92978529417.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f643cd2f7bf---35645875368.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e904edfdd5---kepukuvaguviralatifiril.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/73161905227.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ad04eac0---tekuxufifokavufepot.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/14d89f092d5f65c9ecc9c739f551b50b/puwojutojiwosawamekavafof.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/46052499116.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607da01e09baf---pajaluxudidit.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/07a0e4cdc21ab0cbca42ebf85d110b7a/87171154949.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/9635719021.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/53562190850.pdfIn PDF document text
    • https://businesslife.com/content/file/ziwabixuxez.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/64245592778.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vesudux.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/33450841366.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/megotuzisagibugikukasib.pdfIn PDF document text
    • http://myredm.ru/uploads/file/kaguviribepegadu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91a5016c5e---50580984591.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d81c4bd79---87599729791.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/91913344909.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/zexurixekiretakot.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/kiwupawonuvazituxoliz.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/212767816.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 11048 bytes
SHA-256: 53aa66de756043222d0e20ea2123a42855404bee7b462c476fbbfaa4641ee8d1
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 16852 bytes
SHA-256: 58cd5ad4cc44a212b6fbf0ad76e264de8df08a178b2149a77c3f14cd5eadaf3e
font_02_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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