Malicious PDF — malware analysis report

Static analysis result for SHA-256 6751a0f1518a2d99…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 22:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5eb94d2f3715d3e6ad0d2c1b98c5f5c2 SHA-1: 360f39af01c37f398f89089651efd34437b9f0de SHA-256: 6751a0f1518a2d99e4c15f6ecd3ee485312f9101cf3ada898a1d6d3fecba9945
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://straub-online.ch/userfiles/files/vasumabefo.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b2d2d6a878eda33659a5ef9a8a1bb64e/86708371331.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/raretoxoduxenagevem.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/mizajasedinoporuv.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/25252921493.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/daabcf469acf19808eeb31dac93db617/42475209461.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/dabuzagutoloroval.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/19409951702.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/42880621819.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/29627071957.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/bimov.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9900b31139a82f4a724c1db96ebe7949/24863090261.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/wepibasofirexovijuwala.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/80039503287.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/1327813718.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wugonebepopajupenafarujim.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4004f98c2e---42511241205.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160972bf9b4564---xozapele.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/vevexuf.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dd7b1a36---44541215972.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/ponetudugiwipepi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0af6f418---12751768391.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/1992498172.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/jojuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=libreoffice+export+pdf+image+qualityPDF 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_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 11248 bytes
SHA-256: affad5a32ff2ca952a73c11449beaa6aa1c0dde929889b5a861b72fe0e4b1128
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17536 bytes
SHA-256: ed57e1f1df95db87887dfda12afde721e2a8395efd0e33a89714f50e1d298bbb
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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