Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6cbd622fa8c992…

MALICIOUS

PDF

88.7 KB Created: 2021-08-10 04:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 941c208f8a4e68230724932ec24348f8 SHA-1: 057f4e4deaf1ead6c196f7e8f73b849dea490bcc SHA-256: 2b6cbd622fa8c9922f23765001fdaf49ea7a290364c94ec3f13e3cd8f4d19eae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=sony+vegas+pro+13+free+download+serial+number PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16104ff9a6b5a2---bozutuluti.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/vokojasipugusakitujanolu.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/fepugosabiwa.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i2inakjvkd95bepk07tspubiq0/12238604697.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/zobajaduvajetopa.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43e4391c8---jabovuxobibukaba.pdfIn PDF document text
    • https://lordoptika.hu/files/files/fawaburedaf.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/bofedezigip.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/37519258864.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/supef.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/js6ilg6fol8rcd0j9pdpn25bf6/65326905559.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/2493572676.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/naxopaduwetanerawet.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/retamokavujujesuma.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fd4753e4b58aa8f1ec03b866440f963d/36473800004.pdfIn PDF document text
    • http://valeneighbors.com/userimages/fatimowa.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608229edc71ae---20801054107.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/64479898580.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/gugavadidu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/22184324161e1b98d9075e0db5d508e7/49425273201.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/24809949658.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753dfe93856---11677420893.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/468b25108dfa3e11f4233cf95024adac/woratafubo.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/68530013447.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/65693733857.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qbgfa2mjsmbc9hqaefikqd1l6u/zaxijewivu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/betekuzikakadolip.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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 11548 bytes
SHA-256: 1e7b6541e0c3d0f91d04b5bb49ca24d0077303d9ea6e441e5f2eaa209c972ded
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 17116 bytes
SHA-256: 261b293253a638ecff3267304494af499783116bceb80353f40ea2ffc4eaf842
font_02_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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