Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c96a606db36a9d5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 15:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9926f3663f7fba95a1092d687b5f975f SHA-1: 43c0640f15a4cc8e077c7ab9c0149584b45942c2 SHA-256: 4c96a606db36a9d55126276e2e00663fed51ab9081779bc54cba54e666f169ec
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://shosholoza.de/file/lusavavaviwumidekuwowif.pdf In PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/60741422854.pdfIn PDF document text
    • https://computerzone.pk/file/18908880938.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/55497974331.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210706_8FF2D40ECFCC5656.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acecdd5396b---kitujopil.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093f638c159d---61246290032.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607556b4b29e0---zomekakazufalotip.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/44825428137.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/67362429797.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160da6401d098c---83320903504.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/66066841403.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f23df8ecf6c---nusawoduti.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/71895043029.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/gajisezezewunovivoj.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/xuluwigelagumipagexikilif.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4881b379c7ece13a6d9360d9e25884a2/95742242988.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe3hpbfb0f8v1fgjlo9p4rev8m/zenimexenesomitobelam.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/47465159092.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c0a12402c56ab29d6bd46b053df5d2d4/94705410296.pdfIn PDF document text
    • http://w-mill.jp/images/file/gadesafifigepanujo.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/52011151837.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461c904a2c---pegaxatewisodebakosubon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=craftsman+cordless+chainsaw+manualPDF 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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 10956 bytes
SHA-256: c5f3e6a657ce589232e3bebbbaafb70cb963626c6b41835436c0f712584cf0b0
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 20500 bytes
SHA-256: b4c7ab2de9c52a9a7c9d85afedbf1aafb37119bb5228c22ebf5d918735da399d
font_02_sfnt_off00013134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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