Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae44b216e589ac2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 21:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 360f11142de73a44d94c1b66cd858025 SHA-1: e9de9c766ded1cb89538dd08bbed0736abfe58f3 SHA-256: 7ae44b216e589ac2024f47d4fa0adba4a6271c0e8bf6424270b8afad3679a53b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to download further malicious payloads. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to trick users into revealing sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://queure.ru/uplcv?utm_term=photoshop+cs6+full+tutorial+pdf+download PDF link annotation
    • http://wardwrightself.com/clients/863644/File/pipufumadafepowes.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/iimukuelmnsncjft40g8vq6i82/24370041764.pdfIn PDF document text
    • http://dgjst.com/upfile/file/97040293269.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b340a561a---52351501031.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6adac8d69---39911090629.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/75209260947.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/94909306064.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/347ea6d203eb1ac70578aec0bd751e56/robit.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vugonudip.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/22444250062.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e1d29aba9b43cfdec32c1f09854696fe/tikasakanezonuge.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fe89683a027327b730301a9c609381b4/39491752346.pdfIn PDF document text
    • http://tw-jia.com/uploads//files/202108100700316803.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/tasusa.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/14592824971.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/58614683474.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160863472684cd---fujusedewipizo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5b9d323f5c64e95861f0e96c7e6b03dd/54493748334.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f231cdc49b6e0b0d019a1b6472808219/44835882675.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d6ede13693d201e95475a2c91669278c/sujuzapebuwipo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/tagubijipez.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/01161339b03f7ca5baee92b0499a2fb6/4115785691.pdfIn PDF document text
    • http://vtaky.sk/media/file/lugibibewimu.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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 10940 bytes
SHA-256: 121cd797675f4864c9062b9f4d76ac5d7105cf588a6db62dbc01709609287407
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 16972 bytes
SHA-256: c9bb27114e44c18600a921fef9cf418e7b53a0bd5637d5114c683e1d1499387e

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