Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44eedd5f8c758d7…

MALICIOUS

PDF

70.7 KB Created: 2021-08-30 23:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 17469cc441de49f1b8469876ad544370 SHA-1: 14bea44697a10360b3285b7e5505d6839d56046e SHA-256: a44eedd5f8c758d7010da8647730f78bc0c9bb849a4aff6b8a429d6942b5f2ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure victims to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=seed+of+rice+is+called PDF link annotation
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f1b1e6d8e8251a79fbd42170012a1da6/33530600078.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/tavafapobogepotemufobemuv.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/rotelegevukawake.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/72952280067.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b7956298a7b134c773867e08bc61b7a9/robiraga.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0vkbgjc30t1lvavdogj2pb42b1/23477625659.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m2d459fg96m808qp1f7f7onjfp/salubilitataluxobuxa.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/31350186143.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/zorekavu.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/povuwa.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/89996075426.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/sakikabodotajonewixuriv.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9563e23bc---zalusaxukofibufekavixisu.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/27971733609.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mf7fvucbi4i22psbk578op8777/32337922844.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/70551eae8300eb80e316ce76e69ea39c/kezid.pdfIn PDF document text
    • https://hoongnau.com/upload/files/78146774206.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608626caba640---fopazu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774821ebf4d---fapuxuj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092080fa06ee---11154261063.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bc6a27b54620424723471dac5fe64a57/3241862171.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce20e537f7d---zugixujexutojubelusiw.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/pujofawumajiferomezimiwub.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/29433938949.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/20070049243.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 10340 bytes
SHA-256: 897165dafe642ddaa63d11250b9946645410ec73c96adddc43be844a3d562002
font_01_sfnt_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 14860 bytes
SHA-256: a34bb5aa27cf9575d67461eb212a0b7f7c751cf59ae36a006ffd0ac9829b3df3