Malicious PDF — malware analysis report

Static analysis result for SHA-256 379cc04c2a78c23c…

MALICIOUS

PDF

148.2 KB Created: 2021-08-03 19:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 451607d47cd7da633df195283f635df6 SHA-1: bf4c4a806d2a9f71531f08fbb55955801a6a8363 SHA-256: 379cc04c2a78c23cdcd91bce135041a541e7cfb0170a7677ef68457a6cf48ac0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which are often used to distribute phishing content or malware. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://oniceh.ru/uplcv?utm_term=rothaermel+strategic+management+4th+edition+pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/kinuwunefaramanaxox.pdf
    • http://challendor.com/fckeditor/upload/file/74472913388.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/61cc09db9761841ac2f2481d5c8f237c/natubotisigeg.pdf
    • http://abpaluso.com/upload/file/14624786794.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bba816b87---disululozurixiteb.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb60b8cb7---vawefewulobovipitiziw.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/josuo6njqj28arrkop121buq39/35475260774.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c6e9a7c33a50c4932159f0b38711134f/41011039600.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/55ob7kks2b2k532e6lke932m8c/dopozo.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nd0oijkaiehgfctua29rektm45/mijagekeligetotinafakak.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607178d77bda6---gezudidawavukuxevekuza.pdf
    • http://hakanemlak.net/yukleme_klasoru/userfiles/file/52907150173.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63bccfe90---27713359269.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/283c44ae5dbba08104c08ed1edcd125f/54469032364.pdf
    • http://abaj.cz/UserFiles/File/sovebosuredu.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a29eec19a7f---mewete.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/41164539360.pdf
    • https://pavillonwohlen.ch/userfiles/files/80937244678.pdf
    • https://haisanquangninh.org/data/dulieu/files/jeruzu.pdf
    • http://gediklimakinahidrolik.com/resimler/files/pesagurogaboguju.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/54898594026.pdf
    • http://locnuocvietmy.com/Images_upload/files/79812315879.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ca27.bin
207e9bf2c3c6af92053359ee1ab7df61b2cdee4941bd66856216bdb30cd4eb84
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA27 18532 bytes
font_01_sfnt_off0001fb16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB16 16792 bytes
font_02_sfnt_off0002132d.bin
620305118ecd55b948ea59c13b170014d975f9a236b7d55098e82ead9a30c405
pdf-font-stream PDF embedded font (sfnt) at offset 0x2132D 11192 bytes
font_03_sfnt_off00022d04.bin
a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x22D04 16084 bytes