Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce98b9d83a0b0c34…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 23:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78ea0b9c911236ee6cea1f82af945fb9 SHA-1: db8a670ff7691623633151a4f5d7ded304eb6769 SHA-256: ce98b9d83a0b0c340fc256de5cf6626857212eb0d701d6b2d6105e887abdb4f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://holidayservicemarsala.it/userfiles/files/90227070509.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/b00s906nustf5g200vl3up3glc/52178008122.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7512048d---94780124899.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v9ljvdqj2frlt9ee5hp5o6bpro/12043253476.pdf
    • http://studiogiamberardino.it/userfiles/files/95285411033.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/601517e779010cceaef57d16053716eb/pisuseworazugu.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1303e7adc---pinirejetop.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc1d5c853c4879e74503b4260a41ef59/82373099125.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/540fb0af5f03453909ca1738f85cf3b8/93896952924.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd127f99f84---3149774046.pdf
    • https://samarpanbharat.org/trila/userfiles/file/pefezeku.pdf
    • http://jaatkinson.com/userimages/degojatuzadivenubax.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8c304039---30045205497.pdf
    • http://strandedtattoo.net/file/lutawavekidezenav.pdf
    • http://markone-tools.com/upload/files/pedejirafuzisonuke.pdf
    • http://hgbs.de/userfiles/file/bematipuralob.pdf
    • http://eramaztravel.com/bot/ckfinder/uf/files/12539821025.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/34956882109.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f69f1000---97050173233.pdf
    • https://jamisonfurnace.ca/userfiles/files/kanubu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pj0mbo7dp98k647ft65cf4l4c7/zowonugiv.pdf
    • http://cuatudongsaigon.vn/uploads/files/58864044571.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81156eee4---19710831811.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=strength+examples+in+swot
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe5.bin
7a1dd2162b70776fbbf0fba71d109e5b3bdc37f59dded17d69d9c9c709763562
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 10964 bytes
font_01_sfnt_off0001092e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 16792 bytes
font_02_sfnt_off00012140.bin
fb4d5939da503010b3a7dc6fbd87732f555354acf5ad78b31b106d9a4343dd5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16204 bytes