Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a142ae30116844…

MALICIOUS

PDF

98.0 KB Created: 2021-07-01 17:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0eabb4d0db4d207b2b5b2e8c89de4e11 SHA-1: 6f491e98ed57ad0b287f34aa919b2eeeb5076148 SHA-256: 83a142ae30116844a9e0f6bfc5295b4aa2ac409596ccd3796229f911602a8423
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. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress installations. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://crewmak.ru/uplcv?utm_term=witcher+3+blood+and+wine+all+side+quests PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/970fbed5c705e768e1796aef9b9dad8d/37352587911.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087741ed8303---37610636406.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608823095c66d---kebokijivu.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/64946203488.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/53090734267.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/pirimudovoda.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81fa9cf3bd---16217775838.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a175a475a53---39037610226.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0499a0458c89538f06c58d84e46d3c15/59379988422.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb0fecf15---63875990133.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/78415002111.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1a416354cf0fd386533cc99b0f36ac04/bevivodoforobujutul.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/95153170436.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/43146054851.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850ce31a620---roxuzaxomitubawogux.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/zimubomafomosexekuf.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/925cf9a7e5af42802b2f96cf2bcedb4c/75604876716.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d68fddb7d4635498fc59936152cf969f/25115250914.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/mememekojidarenesetufan.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/99813352904.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/28qa8q090qa72om91nnjgamu82/32523151548.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa727c19d4b---duvezo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec3742b09---nilafidosutuvapelebo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 17144 bytes
SHA-256: 7daa1761826ae17d90cef181f763e65a23649fe20336b71721a6b1d440c71e3f
font_01_sfnt_off0001470c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F23 11104 bytes
SHA-256: c8888cec31082b1f2c0d60f7973d6e26cb0fb9a17c930c4ccbd2619503f70735

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