Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cd7da90ece518b…

MALICIOUS

PDF

90.5 KB Created: 2021-09-19 05:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c19cf1c835fa5722927a5a93bd209c22 SHA-1: cf1b3c9353baad40be58e3f8205d2cc0e3e2c293 SHA-256: 04cd7da90ece518b6083af38aa0de81e931a9b4cfc6f5fa3bbf6b951069e4871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. These links likely lead to phishing pages or further malware downloads, as indicated by the 'Pdf.Phishing.Trojan' ClamAV detection and ML classifier flagging. The structure suggests an attempt to disguise malicious content within a seemingly legitimate document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ketchas.ru/uplcv?utm_term=2021+new+song+sinhala+download PDF link annotation
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bbe2c306---13253643604.pdfIn PDF document text
    • http://eva.am/files/08274bea97b65751.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/92977516708.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/84520765416.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/tiririravonemijelabetuwar.pdfIn PDF document text
    • https://producto.works/userfiles/file/1136979403.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/xosepowuwud.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/37358941189.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/33184743262.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141bffb2b5a2---ferujunanugulijajurur.pdfIn PDF document text
    • https://akemi.ro/hirek/file/segimasoze.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/91446309095.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/vodimagatebefej.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/pam26qgru9o6hqfq3n4a4a3293/82637599783.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/59599029816.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/19095721335.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/62058435025.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/92381272641.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/27680088041.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/55811148241.pdfIn PDF document text
    • http://air-con.ru/upload/files/95301903066.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210911132328.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16134238febf34---dexag.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/goniluxiwelubagijipoba.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/55600476181.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/26164525163.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_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 19168 bytes
SHA-256: ef55e0377e46020c2f747ee61520928de6b23b598f33a01e8d1f4e6175c9d168
font_01_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 10612 bytes
SHA-256: 1c6348c2353acb1a7e4c789bed6a937716b32410d0f585daf832fb6141ff96a5

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