Malicious PDF — malware analysis report

Static analysis result for SHA-256 464625268bff23e0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 16:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9edd8b8a2041100bb66f66bb09013fec SHA-1: 581ba9bb1a15d4994f747a6ee9fe690fb392519d SHA-256: 464625268bff23e014e21e089199c75aa476f77e86bc6ebe7ea59c3a814e5ea9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or CMS upload storage. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://idroter.org/userfiles/files/50008940073.pdf In PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/32692012868.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b9ee287eb4e9abc58529f2bee8f6c76f/89991091302.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/dekotapewofewiwigakifuful.pdfIn PDF document text
    • http://benrassam.com/uploads/files/dokeborolufipewaxetapi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/71ebfc2821bf68abd85542a9c1d05d43/mopaj.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/27363159717.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3kdto4f0v67n6p44rkhtg7fqoq/ropepufoginodavarukizono.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/64688099146.pdfIn PDF document text
    • http://qdjshg.com/files/file/52657189999.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/sonafulajaset.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xatejezapaluzixibopu.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/bekizamefas.pdfIn PDF document text
    • http://canadanur.com/resimler/files/zamozim.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/15951769085.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/noxosif.pdfIn PDF document text
    • http://imoroz.by/upload/file/58144628979.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd1a0c2dc---xesefokiparinivizazoz.pdfIn PDF document text
    • https://superchills.com/userfiles/file/67104943009.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/zajadokosora.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/mupikopufebuvuzodajaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+line+graphPDF 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_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 17972 bytes
SHA-256: 67504997ca486eba42003f175e830637c40d23e62d2f38bf2f376e5a42a113fa
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10128 bytes
SHA-256: 934ff3df5e6ee7b45b26ccc51e92ad9d619f09614f0a06f6bf07f5c906163022
font_02_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1