Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca41f3c753bac3b9…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 02:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aefb4934e8405febe08a93dac689f5e4 SHA-1: 45b2b0c5910e3387ec5ceb5d83c6e21c5a319ac7 SHA-256: ca41f3c753bac3b921a9c0fe1d43713b092f1274cdb627bc0819b633276371e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to manipulate search engine results or direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://geneolock.com/locktactyuma/userfiles/file/ridukikevuvipezebuj.pdf
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/fajikikutotuwovikamesave.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/n5k78mo1f2qi3jgu79fde9bq87/loworafawijeje.pdf
    • http://caratow.nl/userfiles/file/96319345403.pdf
    • https://liur-krd.ru/userfiles/file/5422129449.pdf
    • http://xn--h1aeekk.xn--p1ai/files/file/boxawirubaxavutoxafuzu.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/zurevoluxigapo.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c820fb8f47---widovikumulufaxolatuf.pdf
    • http://sayarbobinaj.com/file/sipaw.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c9ad0b3d36947b37618f64dc7aaf0acc/63336839853.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/radilipinenudabijotagudi.pdf
    • http://aylincinarli.com/fckfiles/file/46881780990.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/unlas7m2ombh50m1hga7dt7s05/maganukigor.pdf
    • http://bettynblue.com/upload/fck_img/20210607/file/noluvoxedo.pdf
    • http://arabic.cz/ckfinder/userfiles/files/25909740625.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vhq6ce5f2qfo88a2js090d4ci5/powibeleneloxo.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qh5p944dr0enj5e737cpqg7am3/3854803898.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a513146a1f1048a6d0177301919fda79/zofag.pdf
    • https://p87.hu/files/16531482082.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b47c5fa9a9f5b1b6af8d2a4174cafcd3/8080892713.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e247bfe6f---13096678118.pdf
    • http://rgn2u.com/userfiles/files/19015690517.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n51qpf52qh1rj96em0afh2vp2h/3570799922.pdf
    • http://clear-es.net/yamituki-n/uploads/files/vevomiviwaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=writing+a+personal+statement+for+cv
    • 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_off0000c0bf.bin
107d5e5f694b96dfa676492a797c34089ad8b05a3536bb8e723b69983f3f9945
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BF 10884 bytes
font_01_sfnt_off0000d9f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 16792 bytes
font_02_sfnt_off0000f202.bin
d22f7d28be5d43d4fb451d71b2fbedc5b8fc8de58d0c37468cf2a2453c321b16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16312 bytes