Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc0d07825bf84e6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 01:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86159b65abb18dd64ff2f7ff2e725312 SHA-1: 4621f23b52a4415a2111a1843f8fdd2d848dbe05 SHA-256: afc0d07825bf84e6957df7d4d9646bb64356b739aeea2632a676043a22f193a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external websites, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://poltinik.ru/userfiles/file/56010250633.pdf In PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5e0ae161f2890cab736605acabc5840f/76039938700.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kisutinaja.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/8700512965.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb56d9a0a5c309dfe3668aadbbb0b4dd/jozodefun.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/dc8dc016935de68bcba2c057ef12e0cc/56975838301.pdfIn PDF document text
    • https://isleo.com/i_photos/file/gosas.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/virosepoxurelatu.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210829_F1463E54A4285D40.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210803010505.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af103e58c---61314448996.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b62f218e0---28083213385.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be50b4ab5---rizaboduf.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/11856827861.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/97276506551.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a845d49d5---2878596487.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/liwekod.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/gigadixowufuwuvev.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/85542380758.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/savuzepowaruforegugu.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/zosomutax.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/24277480989.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb4a0dc00---19581100043.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ff2c1457505c82dbd2881aa65ba88ab/27217095012.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16103ed0ddece1---bazapumopitujixujovesat.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/gojewilopazen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=subway+surfers+free+coins+and+keys+generatorPDF 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_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 11212 bytes
SHA-256: cfdc3b017479a41775fba9aa06f9cbacb0770b10987861e32d2d658de4c2a2b5
font_01_sfnt_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 17424 bytes
SHA-256: deea1a9e78b55b2f14be2a88edbc2108787d5e3c29f1ee315e053cef4ca22086
font_02_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1