Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c872e459b25bf45…

MALICIOUS

PDF

103.1 KB Created: 2021-07-02 22:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b03ab0dd5d4bbdde3006370b4c4b5bb5 SHA-1: f3341ee152c5b667db9aa6f76dc9afb5048a5310 SHA-256: 8c872e459b25bf45dbdff0efd5f2d4d6e815c934649e9bca226b876d7628fac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=the+geography+of+transport+systems+4th+edition+pdf+download PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9927eb33---ligesirusobepuzinasegumoj.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/172dc794da06e705cb41036d1e13ad4e/rekolidirakupike.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/h98qrjvgg2pqobd22adih3uaqr/mizimimibuzopes.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210529112128537.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xatukerixivukudopefa.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bdf9dc783ef0eaf76458bfa8cae335c1/selesidaxevaki.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/kixefidusujiwawawibudise.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/57511543593.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/pakoxatolatitenurubetowaz.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb725924315---zadokewudugopi.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/17783034678.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5afabd744---74780877450.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/8032673817.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/pekos.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kqbh03dleasfaohv68gkuvfps1/93659430105.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/juginimepefekagu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/pawaj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160783a7fb80e8---ralupusugubupijirozulave.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779475c8a5e---30393351056.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_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 17692 bytes
SHA-256: fb00ad7c9a190d9c0a20ce316d864e4a4b2a08f9db71183a2249b35284102667
font_01_sfnt_off00015cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC4 11184 bytes
SHA-256: d9c321fc57faff442b72fba9c5040e668fa35a000579f3846bdcb74bd3255328
font_02_sfnt_off000176ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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