Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd353ee6751db841…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 15:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb3ef083024259485d4b52c4b5481aca SHA-1: 52cf0f9636f7559c013de2871fa768d4f9206b84 SHA-256: fd353ee6751db8417ba14d51d0532816f1516631ccf42c5cdb6595d48b071e83
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, such as the one hosted on 'asirius.su', are likely intended to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://homestationrealty.com/userfiles/files/gijuv.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e1618042ddf6dd1765dcde37e43f10cd/pokarowe.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/22687936147.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/fozisirugemape.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/56879461610.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/50647983656.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/r05643sbo2298gv2mjvtlqealh/90822045472.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/60601239205.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/83102462126.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/jphru757etqmo80nm2rl82hntl/57635364440.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a490b57bb9---wafolomobufe.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3b5b62a5---bokon.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/xilinarobef.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1293773116.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507015830_1301139067.pdfIn PDF document text
    • https://kede.org/userfiles/file/gulusudexufuxaboxoxu.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/duvomoxelus.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0a4c01cb092dd361255d0f9324fe3aaa/43110546053.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/gefosabegibezikilanuxi.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/4c3983bec7b75c2423f1a0a0894c4fa1/riwiketusojorujipigo.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/6099349529.pdfIn PDF document text
    • https://maisonforville.be/documents/file/vaxodabijetapevezonesemag.pdfIn PDF document text
    • http://zerosquareonline.com/file/82773625750.pdfIn PDF document text
    • https://proxus.nl/file/79792261047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=human+rights+and+responsibilities+pdfPDF 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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 17372 bytes
SHA-256: 63863c42c5616783174bf20dc40577bc51c9db1cc6cfcd5906a714be6456adab
font_01_sfnt_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 11176 bytes
SHA-256: b8e484eaab321f0196cc56cd6b63fccfbf18ce70f7d5ae4f4b916c336b763d53

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