Malicious PDF — malware analysis report

Static analysis result for SHA-256 37021d3ddbc37851…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 07:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9634c80bf5eae5fba7523d15ff046143 SHA-1: f09f8df62eed987ce2cd03a44421458e4f552b6f SHA-256: 37021d3ddbc37851b95e4fe4d2fa50ee7c31be40858ffd4aa070717ec05307fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=tachycardia+is+a+very+rapid+heartbeat+that+begins+within+the+ventricles
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/s8h16v25t7ijasb1vrspkbhff1/41224254970.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6e7b5fde---36145326327.pdf
    • https://sjalikave.hu/pictures/file/79966487322.pdf
    • http://ttccid.com/userfiles/files/71834583317.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656bead869---riregifuk.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cbaf2745c16e88ecc7aa18e342ffc336/pobovajanozirumula.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/demomadokapewanasejofemud.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0753f1815---14896679086.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f3990ae7---sisadal.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/903a20adde9fed11a9c75ad9e3767f6f/xeximibuwabi.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7ea1f5bf98c86800b59d0f945b904585/bejigixe.pdf
    • https://bisnismedsos.com/userfiles/file/3362597838.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c6729b5be7b1a6b5cd404010c299f0ab/81568394102.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b562f3e2---temutinirunapodojofawa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/tufevuliti.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085448272d2f---dopiwezawatudalisame.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f8d0f9e163accf505c8d34ef30622050/tilesu.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/66bd973c8b6f95f499e1789f890b5837/sonet.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4959c975143203a6ac07667a7ea16b63/85087948006.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rifasilizubebigajilan.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/gamugiresavob.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dbe3b5b9---somugudef.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4d5d1e0e4d88f8dd8b669126876bd152/xokok.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a26f45a41---91440194485.pdf
    • 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_off0000e932.bin
368c9cb5f9df1f9380dfe9e392c2fa1f2a8514942651ffed269b7ad4b2ae4c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 18904 bytes
font_01_sfnt_off00011b22.bin
33942e28a5778d44fc32e2812e98b1dc69d3e6bc53f907e1f1d328682cef4a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 11044 bytes
font_02_sfnt_off00013475.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 16792 bytes

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