Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9010c34ac48894f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 19:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0072f58bf694b8b77ccc26efe7415542 SHA-1: 1373388a985690afd8f88a55676af6fa3fb6ae9c SHA-256: d9010c34ac48894fb5f30889c32f3acb3faf5d40137deeacbc9eb64b551c05f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristics indicate a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=check+if+text+message+read+android PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3621af854ff048c23b41cb431d77ab44/97321291978.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/15662214963.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/nubuxepelozivexokises.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/90751250735.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acbeeb27fe---42724750048.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/rojilo.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/nixotijiponemupad.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/32340326620.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/fuvij.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/95708296655.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/28460467540.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/2064614564.pdfIn PDF document text
    • http://www.77ice.com/upload/files/pikakexofaxa.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/41993848611.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/44542579342.pdfIn PDF document text
    • http://llux.vn/uploads/files/5803124502.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b27766594d---74229359597.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jelegopubu.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/75730384319.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/41731264596.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109200645325665.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/79197471388.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wirogaj.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/02257405d411ea6abb1e4dc159fa04d2/66625459267.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_off0000b404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB404 11100 bytes
SHA-256: 3dc8c3142668fe8717a78a29985334edce17570668e32f6195f7a7c75a59b22d
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 17240 bytes
SHA-256: 96e2092935293b02e4873802283a103ce07e155b50cbc5ec69c4d7bb58842d10
font_02_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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