Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f28df1eaff76073…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 23:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97a7966cf5be3a5f13e7a4362ae509f4 SHA-1: e861b1c82ae34cfa9e11f73fc07dd6cdec6d3860 SHA-256: 8f28df1eaff76073786cb91ca956ae4a5732c7da042c7df57a0001fd79529825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host and distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely involving spearphishing.

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 http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611404b8593f4---99246060992.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1g03uqc3lk10kb8lhdf96i1gs8/lemupeb.pdfIn PDF document text
    • https://digireg.se/upload/53281672670.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/bitibafavesuwodebilejizi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/jexalonivanojemotipu.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/vudowozivabudodowomaxiv.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nesinokunirejedaka.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/zagazobepe.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/61835950858.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611a55d0d0cb3---6227717858.pdfIn PDF document text
    • http://klaaswester.nl/img/file/posatazagomirojujovik.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/71036549815.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da67a8f31---lowavozorivazida.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/wafeg.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/8ovhntkaa0f1p07oegrbfq7s3i/talukobanu.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/17609960985.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xerinonagumumarazifariv.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/fugefizixobevinefufana.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506223652226.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c7j8sau19ih91r6s3m9f3a2n18/rewozaxobejiwefaziru.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90656086451.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/48382347753.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c025d583006a949f81466888d41fb5dc/lopalakorarifitufujita.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/4391152806.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/87238630159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=6th+grade+math+book+answer+key+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_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 11312 bytes
SHA-256: 8e06882e43fe3c326936d33ef54ec131f343dbb0a3a45d48f331df3fb7863a3a
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16852 bytes
SHA-256: fd8a1908dae2336479d0e6d10cc433461689fa01ff9602830d0bbc47b0890646
font_02_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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