Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0bced6ca455e5d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 20:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4cd1f04aee25a48d9644b85819d575f SHA-1: c58c750b5aa6ce7f03ab61b6cddb1ffb8ce6edb3 SHA-256: dc0bced6ca455e5dca4d2272c52920c16457acd3aec8419eee98bfeedd9d11b7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Numerous embedded URLs point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=manache+shlok+meaning+pdf PDF link annotation
    • http://debeleven.net/UserFiles/File/wepavofixijuvaputogade.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/obkqfehc3sr841cmi3ngenp4ge/vawexowumofize.pdfIn PDF document text
    • https://alutat.com/data/file/37577164676.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/45894770043.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fc3c802f563809fa12aeac34ab6844bc/xapadex.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/54590017995.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b795799c029---badisuvu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/22016337788.pdfIn PDF document text
    • http://altinay-law.com/images/file/bibawilaju.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161275b3d730d4---4435904214.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5656f44d00---1257307047.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16093bae25f004---21062567264.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/lefatigivadumov.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2183c744668362617ec2b798ade946d3/13531658832.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/37960465225.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/1053317598.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/doxuronalodaziledilum.pdfIn PDF document text
    • https://architektor.ru/uploads/file/59709558549.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67cb5e443---47917415605.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/komozanofululofa.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/wegeverorigu.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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 17172 bytes
SHA-256: d7e7b7dd46254d2c7f1ea439f284d0ea6c253130846359bdefcf30bc3df8a1f5
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 10956 bytes
SHA-256: 5fbfbd14ad4ecae2e5505bff85221327916d4b6ad0565dd43ffcae5a0f129c84