Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e871dae53fa3b70…

MALICIOUS

PDF

76.2 KB Created: 2021-07-06 14:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a84553b978ffde2e5e9f50d3c109937 SHA-1: 4e9bcef6a9b18a43e4b90d716d53e7027f2c1bec SHA-256: 8e871dae53fa3b701858212b0e6fa1d08a5df81d84d3b960f64d44bf72e65888
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://allytemp.ru/uplcv?utm_term=mature+hairy+muscle+men
    • http://villa-carlshorst.de/sites/default/files/file/rulajufudiwije.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/64f6f297797a80d1a19f43e99fa88b56/90398358735.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/97548865682.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070935abf80d---23510688484.pdf
    • http://amsaneeraus.fi/userfiles/files/15961778080.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f330acd1e---4063664268.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ee7c23d8---52164487871.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7miaprf2ht2edhepje00c3iopp/83755572955.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9941181f4---xejejifudoneso.pdf
    • https://aulacvn.com/upload/fck/file/dazusex.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2855e6a931d4e71b50b87ee5c465c30d/nixikivajotidutu.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/1nolf6ag83ifn7nkdte2e144td/15161761118.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3ede8069e075636ccf3ac09deb34eda4/30722350309.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a61a18d79---56681418595.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d3de26ad4454fdded86ecb39e41bc2cb/98855106781.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/15266961651.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dd8a84562---xeluwagivutof.pdf
    • http://aep-tc.com/cache/fck_files/file/8364179446.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b1a6d903e40e2f080762efc1c991812b/newugib.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b4c65d4eff445215cc509b8ac26f2acc/79065222213.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_off0000c86f.bin
9d117616865d18ec3dbabd78ffb23f1e763137cbe656e274ea0f095912518e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 10584 bytes
font_01_sfnt_off0000e072.bin
0f202148a9ebe52e15860587ac6e2afeb380708bb1ac3d9b2387329827f29e36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 16792 bytes
font_02_sfnt_off00010c1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 16792 bytes