Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cb6a9739ae2c0c…

MALICIOUS

PDF

98.1 KB Created: 2021-08-13 19:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97ecb16e49a6664d50788a0cc919e33a SHA-1: 46c6e31a8e073711424889d7a9c02c1490f808bd SHA-256: b7cb6a9739ae2c0c39e84e60bf00d1fd1be7da1fdb93f83238fbe76bf11b8212
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

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 http://cuoredicane.it/userfiles/files/26260838097.pdf
    • http://polymer-optix.de/userfiles/file/bazefunufij.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6ff0f72c---47358740673.pdf
    • http://moristas.com/userfiles/files/jekuxalureworiwesa.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081583500877---26821590817.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/52007119607.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42f459f27---fulexitupim.pdf
    • http://tgtech-auto.com/userfiles/file/44164172951.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/06e3ba7a1895878ec714e49ec1410dab/17842020798.pdf
    • http://etenindex.nl/images/uploads/22312044884.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/mrsdfohgtmm2pr3ov53fcvt9vg/89771971501.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/sokemozafar.pdf
    • https://digiconelectronics.com/media/9599460732.pdf
    • https://ancoraeducacion.com/images/jalixegadu.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/l7n0l9los5hsre9u8d34bkb885/78974853906.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/mekikibunegazeve.pdf
    • http://tara77.com/clients/46590/File/pawipajaterarovifoda.pdf
    • http://cachnhietcacham.vn/Images_upload/files/92908992223.pdf
    • http://driver-jazda.pl/upload/file/10799237561.pdf
    • https://asset-books.com/userfiles/file/tonuk.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r0su5ncmujovjhldofpcjk1u6t/96745041356.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735e5522f17---42684010701.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5b3a8bc7---30986628738.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tecnicas+e+instrumentos+para+la+recoleccion+de+informacion+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_off00011221.bin
f67ca6cf7995797b6477c67f604149d70beef0d48c8fdedeae48ce31d1fa28d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 10844 bytes
font_01_sfnt_off00012b29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 16792 bytes
font_02_sfnt_off0001433b.bin
e0a1944f13f77e74a88d4eb25b2be23b69b5dfe26884fbe78132599fd5221499
pdf-font-stream PDF embedded font (sfnt) at offset 0x1433B 20528 bytes