Malicious PDF — malware analysis report

Static analysis result for SHA-256 4149f77336d27eb5…

MALICIOUS

PDF

155.4 KB Created: 2021-07-24 13:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8fe32897c03cf3c654fd86a69c3c93d7 SHA-1: 4dc54783c35fe8664cccf245cea2049299317eb4 SHA-256: 4149f77336d27eb585f127bd7d7c412857ae62effaa86b8054a99ab5b9f1b9fe
154 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7037

Heuristics 5

  • 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
  • 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://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7ee9ff0e5e600938734a34af169a5e64/67561318636.pdf In PDF document text
    • http://wadirumshootingstars.com/userfiles/file///84670069393.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/23543546379.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4ca99b59778cd9283d481007aff88579/84884080510.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/36998397989.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/i3ahhpv2mrl004m226b1q0c87l/ronapira.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160caacf744446---90035392370.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/4348787330.pdfIn PDF document text
    • https://artenika.pl/fck/file/lasafupadu.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f162d0052c1307fd1d183e01a9cb04c6/gulobagilijemejulikogogib.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd8aadaa5---nuzedawujuwovan.pdfIn PDF document text
    • http://garderoba.sk/images/_file/podujif.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be50e7eb13---wokipejufifuvuket.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/50869198312.pdfIn PDF document text
    • http://simonide.org/userfiles/file/guruwudi.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/luxenonoro.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/84610413105.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/429b9748952a354452fbd0601a2d4475/30003952329.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bb048d8bb3c7378c9da97ba0a7b1e7e1/kikidobine.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/sumuzok.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kevijuza.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///74383646349.pdfIn PDF document text
    • http://ippon.lv/uploads/File/15214780128.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5e5b8140---wutubarivagofunekumamu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b18c49fa1---7986397675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=directorio+industria+alimentaria+2020+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F5E 11124 bytes
SHA-256: dc6f8e6be84052db64d2712d586a8c11670a1841ba79bee969edf254e0133100
font_01_sfnt_off00023959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23959 20140 bytes
SHA-256: bb581db95149e62e83b4d23f2ed850d167d3e3bdd2e7f48b950e9e5633e6bdca