Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd02f5880e060434…

MALICIOUS

PDF

110.3 KB Created: 2021-07-18 04:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c80ce52c7baef54c4dfe84e63f3f324 SHA-1: d52f26f89d6d55162734322864407191a9313a71 SHA-256: cd02f5880e0604345d0f6c4682076a784361f9c6038d715d220a211eecaf4383
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://nuraski.pl/wsg/userfiles/vavudopexibazuzamurim.pdf In PDF document text
    • http://yjccnc.com/upload/files/75813204405.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/tovuzar.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1dc6e7f4---77435449998.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/leposebirofexawelizeges.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b254efd3750---55238231583.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/13574041997.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/22214215432.pdfIn PDF document text
    • http://promador.pl/userfiles/file/55005667904.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/11854381996.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k85it3t9vnr8tbfoh7lvaum17d/rojomuwisulijedowenil.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rkhkudm3gl8r0a1pfrgnpjr4q1/81028885849.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509104305.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea9d746b8ca5e3117ffc82f40cf68eb4/14545536804.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160715d3fb81e7---darewe.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zelezetulerolexerejufatan.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ddc22319ceb8d85338b6f4a2fc0e54e6/45332002187.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/54739472546.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b594b7eaccc0705968b107dd986929bf/89708153645.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0bfa3df05---xagamasutubawimimewoxe.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/21790905924.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/08c5e104f3984db4c249de3a5fb19478/22157144896.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/98be421kfh7re6or1urcldhl49/78455637755.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/tonovapajetozufukawinadid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+sports+bookPDF 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_off0001511d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511D 10140 bytes
SHA-256: 45db12e689d3f17bed8fc0f0fbfc18a0c3b1510b09d50f88bf42413c4d0c8c44
font_01_sfnt_off000167b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B6 17136 bytes
SHA-256: c4257265e938574b176791556343a3a25bf4953a73f4e25b47ff8d8e691dd8f5
font_02_sfnt_off00019465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1