Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c3bacc6a8cd67d…

MALICIOUS

PDF

98.9 KB Created: 2021-07-14 10:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25102cfd347ea888b66525fa36ce476d SHA-1: 8fa0f749ce11b698b706460f22b5d5189e431439 SHA-256: f3c3bacc6a8cd67ddbde4b56ff0d51911fa2b839dc1d8db7c3d5c74a49c8ad64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/390e07aaf5cdb62f77d7952568f3bc3f/20184065321.pdf
    • http://broadgatecapital.com/userfiles/file/nugenizoxodelusajir.pdf
    • http://norilskgu.ru/userfiles/file/jevewajolapixuxe.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0acf5bc85---63294201769.pdf
    • http://studioambienteterritorio.it/userfiles/files/39099923454.pdf
    • http://cdmatik.com/uploads/file/pusofodizo.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c148a34ae51---55678721198.pdf
    • http://rencontres-icare.org/userfiles/file/lomikazaf.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc93eac68---sonenekirono.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i0p2cpur5rcd62d11fda6o72vf/gazedizogusevanogewoje.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ba9a5dda---28765693014.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec198d76b---tijebo.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff43814ee2---89401195942.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a452fa399f5---42643551784.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c9337b52e9e699a00f676c9b827ca55/81329745773.pdf
    • http://bobmeetin.com/media/galleries/files/18325352660.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8ucrl8il0tt41ojoo8lfmvj8me/burasunimoredetena.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cd73a375---dagibopikoz.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ad47fc52491789d5984032285710c53c/jogosuzagozigasemojedu.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/81732401689.pdf
    • http://eva.am/files/4a3e34a73e89480d.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e0cq2uts65l166bqueapp6hv40/94634410284.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/xuponitegubasipofa.pdf
    • http://architettoseneca.com/userfiles/files/dekezos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=to+cast+off
    • 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_off00010261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 16792 bytes
font_01_sfnt_off00011a72.bin
5b45fdccbb42271441049b9d8df9177d0bfbd05baff7f937eed8b05804d2ae1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 18712 bytes
font_02_sfnt_off000138d7.bin
529164fcff49f17477d67400cc21a11ee3855767f40ab91a9d5cef4e6ce99cca
pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 9816 bytes
font_03_sfnt_off00014e87.bin
c106cae3647dd625da91bf02240d3b53c7b98a00d3360b5c3d7dd4c189b4a801
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E87 17636 bytes