Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ae7d6774a626bd…

MALICIOUS

PDF

90.2 KB Created: 2021-07-01 14:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9de0741cdb0ca6eb77cb7ade0ee7209 SHA-1: 4879915be7b7e7ba32d42eb65fef321bcbef5ee9 SHA-256: 21ae7d6774a626bdce8700d78a9fa13536d59c0f4a0f4bc13a35bd6b3cf6f096
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress sites, attempting to trick users into downloading a malicious PDF disguised as a game download. The ML classifier strongly indicates maliciousness, and the presence of multiple distinct hosts hosting similar PDF files suggests a coordinated effort to distribute malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f385386493e9adf0629482a0d316c011/nemubasilalajipidoto.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160870ce3de134---94612075225.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f9ec7df0e0231ee703626f263cc8be0f/30361213243.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/pdne08pdnhu1k4eia8q5oeaft3/80515075681.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4774f09ab1adb054ee337ce615899d07/zovovigusedabed.pdf
    • http://varanini.pl/userfiles/file/keripawujujepolomafofix.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f5adbbad---gimisivowu.pdf
    • https://aedwea.com/upload/foto/57899685734.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9126crdp7etc0pgid6pej0l862/54187944620.pdf
    • http://hookmyweddingup.net/clients/73542/File/xepogoxotajavifobeneluve.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755f5c90ce2---1695470237.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c12e65f8aa8a339a8d4a29f960e0be84/98470795989.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/doxanarofu.pdf
    • http://teplolux72.ru/upload/file/28379881365.pdf
    • http://ever-pioneer.com/upload/files/kukofunoraladu.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4445665b9---rasowevunenozelojisorikik.pdf
    • http://henca.com/files/details/file/xakepina.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2dd0851ac---70385670838.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076521457f25---79475087683.pdf
    • http://ehoron21.mn/uploads/files/witadivet.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/935b933cfa020a3b3e9d4a3210201e93/kepaleromobogodon.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/07ldd2ajga9390h6kb9pntquf7/dapazawibova.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a4191a91---jadomovapixa.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0ac9e94bcc39fe4375ae7542cd2d6bc4/mutilumudagujilinosa.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f437a4270---47527189459.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e3c16a9de84590ad1d2a2f201fb559ef/gorevubom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+resident+evil+4+android+apk+data
    • 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_off0000fd3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 16792 bytes
font_01_sfnt_off00011550.bin
dd1e929965527790bdd99d262ff734d01d3a58b6165ae6dfe677a972767ce3a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 17180 bytes
font_02_sfnt_off00014262.bin
5df82beed97f8ae8ce6770ef6e8aea6acded1d0683f0484e7fe82c413d405df0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14262 10708 bytes