Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55262715fbd8a32…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 13:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e2c29b2c6e01dfb7544938ef51ff981 SHA-1: 58b5b2643e72979690c2cb2cf280e0c7d6c838a3 SHA-256: b55262715fbd8a32b39013cc2aa40a2076a6a6c15d57cd6d8f805c318a7febd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to host malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jyjwqj.com/uploadfile/file///2021060414412823.pdf
    • http://centralgiving.com/media/userfiles/file/73787964617.pdf
    • http://bodegaadrover.com/userfiles//imagenes/26834660706.pdf
    • http://tele-video.ru/upload/files/13082916631.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/coptm8vj65e1l6pblsf16guk1k/ropidigeked.pdf
    • http://palaciodelosnavas.com/userfiles/file/62005220801.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a920bbe6e2f---35531693759.pdf
    • https://aimhc.com/userfiles/file/83042020761.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/urma0aalj9jgmjq6tqmha1qjq0/jowepakov.pdf
    • http://capmar.eu/userfiles/file/pepobikedovaneza.pdf
    • http://daonshop.com/files/fckeditor/file/95913752360.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af32cca83d0---32681784135.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de32c772f6---98681135828.pdf
    • https://dienlanhbachkhoa.info/upload/files/nodimowutozudol.pdf
    • http://timeyear-v.com/userfiles/file/zevazuviwefesebix.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f4f967ea4bdb2049dac882a2918961ae/togegeparedegunojor.pdf
    • http://gpszone.hu/upload/userfiles/file/28739511928.pdf
    • http://lycee-elm.org/userfiles/file/tibodenixiwubedizuro.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/02cf9bf47670018059ad53cb7f70cbe5/popogobasu.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e67e2bac9519a84d1717ad52ac1bdf08/5586524620.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f069454454---97614440253.pdf
    • http://al-bandak.com/userfiles/file/98827885637.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/popabobasamu.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b4ff88d0cc631f252669fb18ed7fe8c5/89554354484.pdf
    • http://marcth.pl/media/fck/file/liroxebixutaxo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=iq+test+1+3+5+2+4+the+answer+is+not+6
    • 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_off0001050a.bin
1785bc2f61ad416aa5ba9f62d6459c034716b0c1a6a6415baf4ca5ebc7083270
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 18388 bytes
font_01_sfnt_off00013575.bin
68361bf4c8e2f2a4858c618e9c8bf67dc51e2695284d2137c7fe194a01ea2441
pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 11068 bytes
font_02_sfnt_off00014f6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 16792 bytes