Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c82dd4a4c28ab05…

MALICIOUS

PDF

116.7 KB Created: 2021-06-27 10:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9fae132ed2eae3edcf33f5ce628b9cde SHA-1: 3e16cc0080f47d94d830c04da2a6ebefc550c4ea SHA-256: 5c82dd4a4c28ab05536e419a635105b475eb2936143ec0f6b0b255311a0615fd
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=as+melodious+as PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/73352e59431eaebd074b15de007b141d/gaminunukazexazusiruxojul.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/89476641016.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095c556b1458---13910632573.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/36535325109.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/07d9521481306256f3233238cc287347/pogaduwufajilag.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/32dfdd5ca18fa9a1fd120c3de3094ab1/limovonibezorogewixixa.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/vakotipenujusojaderami.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/jivusujizito.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/vuteguwobetadewivinudo.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/duvinojopajozawikida.pdfIn PDF document text
    • http://poorclarescork.ie/images/8070553496.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c5222a2bdd31b38b787559c8eb779987/32209288597.pdfIn PDF document text
    • http://giga.sk/storage/file/zitusadojuvabokijogen.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/bojenitapufegegolupapenuv.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/sudogojitidumixabe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5128db71d6---40136485984.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/ad9efe57e45ba131f929416ae99ce119/vimozomewefewixapazek.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95f401d7f---94755875521.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a321bd15ccb---4177875764.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a1e4c27e6da39b92a163165b7d4d0a14/fesiduxedalilixu.pdfIn PDF document text
    • http://e-district.org/userfiles/file/94382174443.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa117ea979---namitupeg.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f4b11780---20039427751.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 27316 bytes
SHA-256: cbc81c7c5afd46821b434e45d85df61faa0513bbd11304a58f7db21a3e76f471
font_01_sfnt_off00014ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFE 10188 bytes
SHA-256: c9ef5d00804ee1c53d9e3c33c48e0a03ba7bf7d5d2358001288b66ff58e5a7e9
font_02_sfnt_off000166c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C3 4952 bytes
SHA-256: 867a94660e6137018f28328bc60f6bece79cf71cdbed1a2d86cdc6e6b2e7ab3f
font_03_sfnt_off000178ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AD 27336 bytes
SHA-256: a8cb5ea105ff719490d816403af1f6dadff1f595af26438deb0001e787c8675a
font_04_sfnt_off0001ab66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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