Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc93c4d47701651a…

MALICIOUS

PDF

73.4 KB Created: 2021-08-31 15:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24eeafd9e46b63d1bb1a21e861437f39 SHA-1: 4f347f61e5dc2883278083fb0e864502779a2629 SHA-256: dc93c4d47701651a89c62ef9eba3c17add76ec2024e6b6e7d33dbac825e1570e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a spearphishing attachment used to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=attestation+meaning+in+bengali PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/99b9a5d6c0246aa72d0fbadad9587df9/59343889562.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/81293437445.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9126f7eb0a2004db7dfd953fcd106a1b/10410517818.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161042db4e1b53---vevunisa.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/1691434909.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/49991676415.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b13625c2ed6---66037656195.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/27176936830.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/46539229280.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/fenozepik.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/1852221629.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/muwedigenitudoxale.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/71290026875.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160896dc1f330a---57798552750.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/zemolabejefora.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/12210752649.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/totobasubanujajudovopaw.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/modovomipelovofuvuw.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81a88abbb---vidogutozigulokuzonep.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b61bc13cf---93860985603.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/bevimukexejatidokolo.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/45544618824.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_off0000b5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 19400 bytes
SHA-256: c2c4ec4ebac81f98f141900d9772a68dbb790a9bd1025563e1411f335238df34
font_02_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 10472 bytes
SHA-256: 27b21f67082e32aa3c668696582867131c596fed27224a16d12498bc409dee45

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