Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b3d8781349739a…

MALICIOUS

PDF

77.7 KB Created: 2021-07-06 14:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a718b72773ddbd71da50cdeb891f2273 SHA-1: 2fc80e071006576d51ea9413cbe9fa77e605cb6c SHA-256: 68b3d8781349739a1c45d8f42317ad772b8243709dff8da62bfbf9846263162d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress sites. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a06174a1f---44043114610.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f16e21c29---tijelolipefi.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5799f182a5e0936bf197f360cbeda817/lepeteke.pdf
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/47681378800.pdf
    • https://ruiguoex.com/upfile/files/2021/06/04/73883870902.pdf
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/jukaporatoweg.pdf
    • http://autodilykanka.cz/cmsimple/images/file/rekanogejanawonuwemib.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2876a5ded664cd7c3abb1d7f72228970/gopelusakimamubipomodiko.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/gosokimuginofimaril.pdf
    • http://batterseataxi.com/survey/userfiles/files/93103207705.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/63834637760.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09b2e798b---tinumok.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084190d21ce0---zitotuwivumojizisagu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da07d89b7c---15477420223.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/268f60e13d423f7ab3cf1e98b5a6944f/fuvotakofepupevofadikebix.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210617171843.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5c0b3aad---xuxogenin.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/dm6695boiirhonbv2543brucim/86552172753.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f00b51305f0f2d6fa70e4509c0a0529b/45695555440.pdf
    • http://drairtools.com/ckfinder/userfiles/files/39671747060.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2590da47a60abe88b1551a36ff0a3e23/sulobobesetaditasotadiro.pdf
    • https://geya99.com/ckfinder/userfiles/files/67995981986.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/11276eb132307dcbf4cbd316ddb42d1b/zofobadiwabodulakogote.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=female+spotted+towhee
    • 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_off0000cde4.bin
d29a74590b2b5d4fe29b27d4c19aeeb1332009f80904018a39f807a0e48f9dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 17028 bytes
font_01_sfnt_off0000fa06.bin
293d6406fc1c2e65f15cc3ee58fac110b0a50a6fee02b2939c257940958d8d4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 10424 bytes
font_02_sfnt_off000111b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 16792 bytes