Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c9b7bbcd735045…

MALICIOUS

PDF

118.8 KB Created: 2021-09-05 20:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7cf4f0a0410aab2f28ca52f9835dbef SHA-1: 4f04da6f6050c5790c589c7fa0d2e9e5e4e528bb SHA-256: b6c9b7bbcd7350452d01c118849583c64250dfe5b5f0f8d877855e12dd7f2775
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads. The presence of a 'Password-protected archive handoff' heuristic suggests it may be used to bypass gateway scanning by encrypting a payload, which is then decrypted using a password provided by the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f3f35aab5bf25644bf6c52af1dbf592e/kepogarozav.pdf In PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7a1ef1d9---20215861243.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dmtp0tbonmfc38hkv13h6j5r1m/51214021013.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161278230b68a3---lawewugulifedasivi.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rojuxevod.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/47443057828.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a2f706ff1d431b64314f85c1914d236e/93871075655.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/31671715132.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/kogesilujabilad.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/2165191633.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/68186285210.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/rokolisamipagunalusa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a1fdc71e1---viziliwumu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1793dc83---dugobis.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qclnro940d0je1r6att767clu8/tiropikukikelemor.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/26195851268.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/79674235861.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/27545647863.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/sibalodeka.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/53360227240.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/bajopol.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/xovigebomobosomes.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/34587149399.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/nemupagive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=atomic+structure+worksheet+answers+skill+practice+8PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16661 11108 bytes
SHA-256: b433ef0888a0ee27d26e09bc5857d0000cfd369aa241d22e2b871e149386c75c
font_01_sfnt_off0001802b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802B 20064 bytes
SHA-256: 001f7a162286d90dc89d120d621ee713d4a2891ed104dbb268174f28777f4a4d
font_02_sfnt_off0001b4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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