Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c667dc4d669378…

MALICIOUS

PDF

96.9 KB Created: 2021-06-28 21:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aa0ab3a583bf4ed1c8deb006be6642f SHA-1: 0015e0b48b80d674a0a33a479b17d367edaa739b SHA-256: 58c667dc4d669378b8a9df383f1108989028d4ea134f3651f0a0bf71f155553e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of external links and the high detection scores indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://synerhu.ru/uplcv?utm_term=1600+calorie+indian+diet+plan+for+weight+loss
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af498774b15898f5c438230e54cb6d54/66545197006.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9bfa3183---jutewaw.pdf
    • http://helder-effect.nl/userfiles/file/85760147630.pdf
    • http://progfin.pl/userfiles/file/wibusewum.pdf
    • http://hifi-markt.info/kunden/kronhardt/ckfinder/userfiles/files/tuzuwowikelofulovuw.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d2234f0f80fe95cbfb8c4439c1ced592/95224585210.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7ab49a23---14058256507.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ff314b610fbb54b7db68cd2aa0d9c098/12341673517.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b0fecd5d---82303407222.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/084b62c1a851f1d4815e4b35c85b0f83/15431433728.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b740daf83f---torekimopupox.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/sujavizoxifof.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/rujotix.pdf
    • http://birkhoffhi.com/userfiles/files/sosujaresi.pdf
    • http://deryalvincotokurtarma.com/userfiles/file/vilodezogaroxid.pdf
    • https://amatnieks.com/pictures/image/56327088468.pdf
    • https://holocaustresearch.pl/nowy/photo/file/21806393621.pdf
    • http://htwy.com/upload/file/wopanorafugaremu.pdf
    • https://attack.lt/images/files/75839433982.pdf
    • https://avonsteel.com/UserFiles/file/vijesa.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077665cb050c---xoguguxawaposedate.pdf
    • http://ogledalata.bg/uploads/pages/files/japasetawaluken.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef9cdefed---78078494425.pdf
    • https://mmszke.hu/files/file/38280431450.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_off000118b2.bin
9e209613ba79e87f726a27c473c274875d40c7e83d3332c492637d914799907f
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 16504 bytes
font_01_sfnt_off000143c1.bin
4bff3642645265f62d055485dccde003e75c65bced1fddc9e2f1762cd3eb2158
pdf-font-stream PDF embedded font (sfnt) at offset 0x143C1 11228 bytes
font_02_sfnt_off00015dda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDA 16792 bytes