Malicious PDF — malware analysis report

Static analysis result for SHA-256 298fbea4a4381f3e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 12:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99d19f75cee460d7dd66e118ca815569 SHA-1: d6f25f6a81d52a65d2fe5e5bde63c50d614ceebe SHA-256: 298fbea4a4381f3e3298a2e79937f0a2ed569beb61675aca2d53a55dabf4c9b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://entone.es/wp-content/plugins/super-forms/uploads/php/files/09a303c382f21067305272454b6a0cf6/rizevoguvoxinuvepopezepow.pdf In PDF document text
    • http://yorktownhs1987.com/clients/57482/File/zinebejepugip.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210825042520725109bzsew.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/jiwuzefobat.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/wikufusomibola.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd8b6dd93d---19104934145.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lidudumubuxulurit.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/9637386602.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pigosakuxomegamebejorem.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/kefizotureza.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d8b2f429---notaxabivenesozibut.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb9ebc873---gafeferiregoveloteje.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/17650148948.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/rujebuwoxa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2avnqvf9kbl7sds9dn3i15lcu6/58917000583.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0c0e4fa309d072629a5a6bc1c047141b/monabatepajosetaz.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607774a12b3c6---69500866075.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/29151730919.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/18790694223.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080519cc0edf---81750364477.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/pigipudoverapizoxitud.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5808a32442---fafom.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/40140336931.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/jumimidata.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3a924ee44669f14afe41b6b2bac5763b/xazebal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=preposition+exercises+for+class+3+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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10888 bytes
SHA-256: f906e76c73530a11c7cb2404a918ab377d1851903fa9cdac9567021f38ffa886
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 17668 bytes
SHA-256: 2a95935b88c5b760f0f937783071b43b05e61dd9f745348d45c5879a410e9764
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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