Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd22ac1aa42cfcce…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 15:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd82648c8a184a51923cbb60c6c78a45 SHA-1: b671bfa2435b3be0cc078b15116d66140a450d6b SHA-256: fd22ac1aa42cfcceba81b20c6ffe9b031c5ed5654cf0e8cfa503e5b5d23ddc62
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://kancelaria-perfect.pl/app/webroot/media/files/61835218873.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e815810eb8a8f4b49194679f3667ebac/28653546169.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacd0b283f---sizonugep.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bade83920c6---risezujulataxewiwu.pdf
    • https://gyandeepjkss.org/userfiles/file/26129250818.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919736698a9---4439509700.pdf
    • http://motorlustor.net/userfiles/file/fagisexawejimageno.pdf
    • http://sjar-tech.com/uploadfile/file///2021060403483060.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c476d5562---62734052171.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16090333a5e33f---51863280345.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a45c2ceb5---mojarixigivid.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a332b3224---makedefej.pdf
    • http://amoy-art.com/Upload/file/69315220667.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931c219e406---65012818999.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609625c263aca---gamaxawefajixetogog.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/48330529742.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00c758e3d---47703725388.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bdce0ee32---14168783052.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cac9d0badea4098fdaec902744c028c8/wexifikuwab.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af01416aae---74043922312.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d85029c6d7164a79f014430a1e7878a7/dubidopemumepera.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7023e6518b76449737751b5aad12a7b8/6776554505.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/d1fr1j7lm991p9pvelbiej11ed/55304084530.pdf
    • http://sanders-scottfamily.com/clients/26926/File/43469190599.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc5b05913---zitunagamesadefej.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609092e13438b---15607863407.pdf
    • http://ifa-astrologie.de/userfiles/file/wumasexuwo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=live+with+a+slave+teaching+feeling
    • 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_off0000ed04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 16792 bytes
font_01_sfnt_off00010516.bin
2ad3bafc5ae2d83d8287a98d4112fee335e32a0c8415aff2b96ddfd87bde7554
pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 23872 bytes
font_02_sfnt_off00014026.bin
ca4b09e9ebe0a0fd8b01a6e87dba1e2df4eb7edb9045c2d80d0b7b363f23d284
pdf-font-stream PDF embedded font (sfnt) at offset 0x14026 10504 bytes