Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fba8cdae4a7268d…

MALICIOUS

PDF

86.3 KB Created: 2021-07-12 23:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aff3b7c382289d450edb4498eab88cc5 SHA-1: b3fa4603ddd27f7f34c0b711477e792a265f37a8 SHA-256: 6fba8cdae4a7268d6a731cefba3c9f1418128906e755564f80f45788ac67faf0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2df96a5a3576dcc6974fa088f1386426/78629520047.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af62f25855a---49504556524.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b4bd5b2a---wekebiwaxiliduwipud.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/cad8d498a8f4c8a128b18b9c6481a405/dasanubegufunajobibi.pdf
    • https://powermailer.in/userfiles/file/ferusuwesamozo.pdf
    • https://binarbaid.com/public_html/userfiles/file/3698287329.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e351e72b0---gaxozikavudenixuliwewam.pdf
    • http://accessiblevehicleservices.com/userfiles/file/vewugiboguroxixow.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/muvewedab.pdf
    • http://sahamit.net/userfiles/file/32640555678.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48a277b52---73807822279.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8c56ddcc---sajajurolunegijimi.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebeb7f400---zetiz.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nghr42jla3jv5aveh1o0oa0mbc/sofubuvadexubuvam.pdf
    • https://actor-conseil.com/files/file/xomefeg.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4baeb9585---silobavejogavapeziwesa.pdf
    • http://csc0731.com/userfiles/file/20210623190831_iagdka.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdfa32896c5a69d8a8cdeb38759597e9/vinivepo.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/zunevikifitupodikobezux.pdf
    • http://tfh-filter.hu/_user/file/tewuzoxiwuwirupefuko.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/47049139457.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/688b3f818e751b945bf28ea36b61ddda/54674796620.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=conjuring+2+full+movie+in+tamil+download+hd+1080p
    • 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_off0000ea81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 16792 bytes
font_01_sfnt_off00010298.bin
ada53715dc30e8ab669c4b46f0226c3948f7b95f27c9248ed96fa78ea04ae12c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 11692 bytes
font_02_sfnt_off00011e30.bin
cc12f88dd90245533a9fab375b65f6a9b4b0abe538327b55527678c38a52d80a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 17360 bytes