Malicious PDF — malware analysis report

Static analysis result for SHA-256 a254d03f542c0009…

MALICIOUS

PDF

109.3 KB Created: 2021-07-09 15:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd6e44c76553a70f83324c2273e96190 SHA-1: 9411bd598cc9af1acfe7167fafdb6032dfbb0850 SHA-256: a254d03f542c0009d81afb33a8452dddb2454d44244f96669800646e84ca29e3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous domains, including compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL targets strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fejerelev.pdf
    • http://littlepearlbooks.in/data/eimages/file/89780588750.pdf
    • http://sahrugs.com/userfiles/file/timevigaxe.pdf
    • http://www.saito-ken.jp/userdata/file/dikaxegujelopujifosasowof.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73b84d9c3---lisululesugesap.pdf
    • https://eobliecky.sk/userfiles/file/30403833891.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa775cbc8---7920610889.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/m66b5528e6a2hhr3slb6kvo764/53166451449.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/55b84ed77767b4692eadcdac5557ff1e/30957886878.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/6348326803.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7ejk724m6ulhcks518844ln01u/77038844230.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc5c19dc9---30532155828.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641094dadf---44540897633.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/157838hb8an0b82jhtlvh8dt35/wijupeledikinarobumejobo.pdf
    • http://studiotecnicoprato.eu/userfiles/files/32475054876.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3d7d2c6a---gifarudigogiwe.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aa783dc17---1629082809.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5655327595132060f1f82195d7ac551b/34931776787.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2384ce1bc4---biduxeliralul.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1983c727---14956327813.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607783e17629a---58685014348.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=study+of+osmosis+by+potato+osmoscope
    • 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_off00014962.bin
cd4a3d23cba94817ad114e3cf46d8ba830bd33764dd7c76eb4e2a1f0eda5bb02
pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 10960 bytes
font_01_sfnt_off000162b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162B3 16792 bytes
font_02_sfnt_off00017ac5.bin
25833ebf391d249a0949c67526e6cb8335f10db4bd0883bcfbc706fe24141ed3
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC5 17184 bytes