Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a0b40c88abd9c5…

MALICIOUS

PDF

93.4 KB Created: 2021-09-08 03:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa20947bc0d5d6d16a83033183d2d942 SHA-1: bdcf7f7dfeb56484c8bb1f915f73165b6b282bc6 SHA-256: 88a0b40c88abd9c5ec9309576f76e1f93e6fa33e5174b96458347a9f9efdb4c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://laborke.ru/uplcv?utm_term=catalogue+c%C3%A1p+%C4%91i%E1%BB%87n+h%E1%BA%A1+th%E1%BA%BF+cadivi+pdf PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oargu54qa6sc75e9cg4u3dv1q1/85681137951.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/89755608028.pdfIn PDF document text
    • https://blogsma.com/files/48598140861.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210809154405379628sx22h3.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f8568bbec24a38c969b008342f7cb148/wemazesezupanujuxoxu.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/98591494753.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/kevafewuverot.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7e286f525---xuteduzozavoxexowuvawavi.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/xolubuvutokogomenu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7a261df6---10405610954.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/raxodelag.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/62169770265.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/dcca4265d500c2c89f5c69d323806227/45193689621.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/tuzedural.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10f60a6dd---81444895540.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ab402593---terelega.pdfIn PDF document text
    • https://music-group-store.com/upload/files/68984552110.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1ene1rohhuhghun7re4ptr3p9l/xipofelerapebenagesizived.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/sejijanexiliga.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16235894208476.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/sizotisa.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/lewuzugusokasifiminunadu.pdfIn PDF document text
    • https://kaimano.it/file/tesomulajetumojif.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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 11760 bytes
SHA-256: 838a5804a0630e3237956d7c1fef3f5cf93dc5bc8bfc036c0f4e332ad402d34f
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 32164 bytes
SHA-256: 95ac75b2d160c6ad231fdb1c23ddb786ca620b7efc047f7d2413dbf246f7cb33

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