Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9d05b7a8c493f3…

MALICIOUS

PDF

89.7 KB Created: 2021-07-26 08:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dbd6c9f108c800d018ad690763ad08a SHA-1: 919909f06dd89f5e44cf1ab040cfea8cbc1f768e SHA-256: 9c9d05b7a8c493f3bc162036ec8ad9991ddf44d084ddc5ebddca664c6ab37cd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination and evade detection. While no scripts were directly extracted, the presence of a link farm and the nature of the heuristics strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://agrilaui.com/userfiles/file/46671231610.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/32809670014.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2ht6n3ckfi87d7g5ob966us9h5/92438412526.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/wiledaritufes.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acc642e73ca---49636077923.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210623022147.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k3ufvsfd9mdliual2cdpfk2bi7/39089866705.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/57990e47d477dbe8758f61de75cad27d/naxadot.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/2e22a53480f502194111636336305d82/94676377251.pdf
    • https://laatjehuisweerstralen.nl/upload/file/93447743370.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/07e8bddf60499c80fb75af744e82be67/18928000553.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc9c75f2457467fb42fb3cd8832bc866/9464739943.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/93438078274.pdf
    • http://irollee.com/userfiles/file/lenotozej.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ab636086a5f1b899bd84388d00865257/97306058735.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9tb6ng1vj33ldrvb1hgt9j7fd7/rofelejone.pdf
    • http://dalaichau.com/files/mukomuvaze.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b049eb7a662a02a8944c9bb1310ab1a7/gifimoridagaxovugub.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fa3fc4ac7b8c84ef85693a565d26a11b/giwulepapomajo.pdf
    • http://abwlanham.com/uploads/files/86463812166.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e8116686---29708361880.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/sutenixofetixifiw.pdf
    • http://ypdtools.com/ckfinder/images_store/files/sidemetijububa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jaws+theme+trumpet+sheet+music
    • 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_off0000fadc.bin
da142d6d29c40265fbb37a9cc6183b9b40930df100fe3418f9de5c2f5e67663c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 17044 bytes
font_01_sfnt_off00012721.bin
8035f860a2b8aa725c90678465058dd96990be2a9a1276c891401bfd26e30e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 10544 bytes
font_02_sfnt_off00013f41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F41 16792 bytes