Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc1b0f6df8f305d…

MALICIOUS

PDF

90.3 KB Created: 2021-09-02 02:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7446188b01f7dfe3fb0595a4cc7db1a SHA-1: aee5f7c022830754439b7f080bf322aff1d74e28 SHA-256: 1cc1b0f6df8f305d812bdf35f5a487d11ec77696391d70cad98f431e40e459cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=how+make+bow+in+minecraft PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b8149186---fuxex.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/foxidubi.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/87365766821.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vevabokaved.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/nusuligaxoxake.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/jajazedume.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a953f2ecbee---gukuvodepobizerizukibe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dfd55d5c0---xaror.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/90866041412.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/narofakefe.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/42699713743.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kizufuvuwuse.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/gilomo.pdfIn PDF document text
    • http://houselandia.ru/files/95420523059.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/41624131275.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/kabojo.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/16994665093.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/949e4d9d76f3910c68d7a8955cab65c2/nikawuluvudesexelo.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zopesogoniguxar.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c80ca386---67435730547.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/xopojojixowabekigubikev.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a20186e9d07ab60f401d4b5da00724bd/14262415829.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/xufositutadakedabafuloxal.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/41886260232.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_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 18780 bytes
SHA-256: ea1f2807526d93f0c280c54d6b679b4900a2df0fb27a8ec1c48579495f89fd3b
font_01_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 10592 bytes
SHA-256: 1105e01cd8e6c88c98e4ca88a8f36c631b5ce5dbe5d7100ca053edd78c123064
font_02_sfnt_off0001430b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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