Malicious PDF — malware analysis report

Static analysis result for SHA-256 f187c9bced6ae91f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 06:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8cd0b142fad43949009c9b3687bc0d8 SHA-1: 1a66b5950dbd36e98948a1694e4ba3e178c30be6 SHA-256: f187c9bced6ae91f38a2ffcfdf9c6d8bba675b47e2da7e3f4a02cadf14eab6af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including one pointing to a compromised WordPress upload storage, and exhibits characteristics of a link farm. The presence of a 'download button' lure and the ML classifier's high confidence score, along with ClamAV detection, strongly indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cleo+cheats+for+gta+san+andreas+android PDF link annotation
    • http://laiyi-art.com/userfiles/file/25406724732.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/75674354324.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424fa9ea8cd---88075626872.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/madagafaxijuref.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402df32f950---61172812439.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/30826976505.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/48509272455.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210904_23_50_9.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/2728242136.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/pakewotugavadakibafaxanev.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/220039944.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630957427.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/49355231281.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/20359094860.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c87e04121d307cdd5e52cadc43d7d94d/jogoru.pdfIn PDF document text
    • http://benetalent.com/upload/files/nijigesawuvigameg.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/21584889559.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/jafugajobakiniwusuna.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/98000019928.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/nejogunufigudavef.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/412dio8uoosu76obas5cdub811/bigupafatoporajo.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/bekibitajud.pdfIn PDF document text
    • http://artdental.hu/editor_up/gukegamomumobuwamivedamu.pdfIn PDF document text
    • https://maviet.vn/upload/files/melenifiruzobipabij.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dojatenabekuwanedize.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/27382673719.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_045612.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 20376 bytes
SHA-256: 8a2671001ebed18d554c115d0385c62e2b2d57a297bc1176febdcac2b66be5c9
font_02_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 10784 bytes
SHA-256: 0587fa1842741b22a5ec1dfad5d2a3e0697a8ee5f4b672d6df20d4c21378af5f

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