Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7c6b9c4f338f00…

MALICIOUS

PDF

95.0 KB Created: 2021-07-31 19:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8daca9fa71af2e12ce9c0c8b2fce2fdf SHA-1: 9cb69cd712c0203c7b5c687fdc27edd1e5325817 SHA-256: 2f7c6b9c4f338f009079fc078b96f44c3dee103cc6e4d7455d049810643346a6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO poisoning or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/3cptl548bequo9sqbb4abd7cr2/laseturonozuguxutezizako.pdf In PDF document text
    • http://stattus.com/assets/file/xodasugiwimivefikuxiz.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3812284926096b08059d62.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/35570682457.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/rerukewelo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e2cf09410258fac5255775631b9dcb06/tepadutajokakubedewugejan.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/61296523189.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/81371072539.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e4d4d2b0f698b2427bb00d1c09c9b323/xojejepew.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dvl2t3f0vvg0jsja27pk2h6a0c/gufakolefalodasixomeserij.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9a66f495---27957373725.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/41244380852.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094f81a448---tudazajisukamis.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d89563665db---73337096544.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/sofozegoluniw.pdfIn PDF document text
    • https://kede.org/userfiles/file/dawogavavizas.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/pozudurakulokux.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4daf4d5f2---74180326742.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/74710482060.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/810c21860bc6cd221f827f14324fa326/gatakogozupelozefefowotik.pdfIn PDF document text
    • http://dogable.de/userfiles/file/32327973631.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/19119144642.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/81734889592.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/46708765323.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/50262611689.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9920a1fb8---sawase.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xuvubogezaxegisupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mortal+kombat+chaotic+2+charactersPDF link annotation
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 17544 bytes
SHA-256: d382e590bd65383a87ab84c6954134bf7d5f232f6e8fc56c191593928d860004
font_01_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16904 bytes
SHA-256: 0791a6f7386b5369897a6ffe44fd9c5a195fb27bab0fb546c1a21db2911f44f1
font_02_sfnt_off00013c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 10736 bytes
SHA-256: 7ea2903839786f0834d5bd7537503a0a566a22da331770ed0a78cccd4f9e79cc
font_03_sfnt_off000154e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1