Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46bb660bcbe176d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-18 01:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b3373408e8c3cecdf12e399ca24c360 SHA-1: dc16858e8c821d51b7b4703ab44e9d4d6c8fb5be SHA-256: b46bb660bcbe176da0b04b2aa3c0640f83ecdc5c82aa1384bd42aa87dd485872
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://progfin.pl/userfiles/file/6133922715.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5a4027d7a---rudigasamuzilozaboje.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5d9a64460ca3ab1fab0f48a8dfe5ea06/loselagokit.pdf
    • http://bollywoodsalonskokie.com/admin/images/file/dazabinikaxukutibewalod.pdf
    • https://dvg.asia/ckfinder/uploadfiles/files/70497533982.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8052adafbaa4ac2d441b412891fb1950/zubofonoxafotixosatir.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f339b5e3d---metib.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/o822kihftselouhb7d1sje2365/nofefolet.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8d9f1a94---85649019820.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070879f2fb9d---fagobexizibagu.pdf
    • http://urjabatteries.in/userfiles/file/75686395889.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/358a65dd0e59d83fccf53e7ee60ea27f/98740839346.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/49c3f6b0097af626926db49c9d30bd22/sijulabodebivutefewes.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f4a6f1df---20138419339.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88169c5632---vumebukadibir.pdf
    • http://pincailight.com/zk/UploadFile/file/2021070515511273499.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l5ajrnqoshecjhvnt24ai4sqj2/vovixotesokokapegewow.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cccb82552---balatiremegexizona.pdf
    • http://cartopack.com/Images/file/57272815593.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/tusogibitogavisujutes.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/13401179854.pdf
    • http://hyosangjo.com/userfiles/file/20210618021513.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608624561ce5a---35973011869.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de96e1cb4---27112880373.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f8071619---92579119091.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bunker+golf+course
    • 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_off0000f75e.bin
a30a11183d0cfcd66f6309205c9d375b2ede1f0417a5fccdcd91eb0bd0699ba2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 16228 bytes
font_01_sfnt_off00012167.bin
a09627651db1ecc9ceaa30826022954efdbd5ff4b71e49596115ff0869694ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 10404 bytes
font_02_sfnt_off00013923.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 16792 bytes