Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bda700b332fe60…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 09:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf9a6f7efa193d40b1337a70e87eb99 SHA-1: ad15c605b450938a3fb7935da4c1caac31d57c0a SHA-256: 31bda700b332fe609914ed94827f3a026d3ab48df59f0fc77a51c0f1ec7b0285
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to further malicious content or phishing attempts, aligning with the T1204.002 (Malicious Link) technique. The presence of these links within a document delivered via email would correspond to T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d9ce1c02---mibemogekulu.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721707d3535---zufekugufolabidomikera.pdf
    • http://chronocertif.com/userfiles/file/wepabag.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/kosavixiziwodom.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83e919830---92315679095.pdf
    • http://ampletrekking.com/userfiles/file/65380966685.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/101517c9d75e2f4730028edb1e971c0b/suvupoxanasorel.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fb25e7b4b673caf88cae00f9508af607/boxobigavoxetaxifew.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076001c5acdc---54025267309.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624273564_3c89672f09.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb4e53578---92707335130.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/0865a349379979d34e3344d71d1a5ce5/9536664899.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/dab1d74a2f13824dc83ac24a0bcb833a/lopupabanitebuzonajam.pdf
    • http://jjmcp.jp/userfiles/Image/file/kupeliwepuvutovet.pdf
    • https://clove7.com/userfiles/file/nawuvugafiwuzomiteba.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6556c7161df1a4f06f8a78ae52c8660c/jowagaluwujojim.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mkjhcni9di5dd1ntphlu5ob0md/wazowojexasipizivoxipefon.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee14756ead---xanebabuwevoxuzumefasob.pdf
    • http://pm-ural.com/uploads/files/tafotis.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/88189257863.pdf
    • http://capitaloffice.pl/fotki/file/mizevakirewupip.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-3/20210603033022452130.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/pepewusizavetameko.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qoo01ujim843pa8mt3pnh8c8c6/92044105972.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/67262977937.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d2276d35ab21a996e49d762e47495407/76213479757.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=44+awg+to+mm
    • 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_off0000eb34.bin
ea6db4d583d0ae2fa190ddee495bff33d9207796cf676003f4f267f3f1d43e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 18316 bytes
font_01_sfnt_off00011b2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 16792 bytes
font_02_sfnt_off00013344.bin
022f39e72e21ee395950f3cbf62b30fb0ef67aa1e81f16cbec673e19f7afb8cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 9876 bytes