Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9a992da0afee4e…

MALICIOUS

PDF

94.5 KB Created: 2021-09-06 02:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4df6fa0c6dfe30afc1947771d90c2bf0 SHA-1: a191dd1952851c3018ada26ea3b294f951cfc935 SHA-256: 1e9a992da0afee4ed97e4445d11c32a2508ef5d7623266d03f208227d720f78a
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites, likely to host further malicious content or phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2738bc6f9---lubuzekemasokoxuzugid.pdf In PDF document text
    • http://ahchala.com/img/file/bibugivilotivesusil.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/jemipagedin.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acc1d70c---14893923084.pdfIn PDF document text
    • https://kawanmto.info/contents//files/82778253864.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/ratazuvazibuzifa.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/89148464800.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/38bae21f65b4449956b061dad3ac793f/86553016445.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/zisetujaloxot.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/32033596111.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/mezuxujujeladef.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/tibonaliwezarisuzad.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/90tac8pjb7m2gr6qef0eko28s3/32303316058.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/28602620574.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/416ad7dcdd0ab9615d141f2e4eb5b76f/jufapasidopupodivasoroj.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/28077876437.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/51345902802.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609856101d835---lodoripesod.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0b6103e8c---gigosuvafomevovopus.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/61356356583.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/97637401275.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/dijepafupinexokona.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/kotiwoginamajoxanasudonag.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/kokabikajirudevu.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/7427759254.pdfIn PDF document text
    • https://t2sc.me/userfiles/pelodokuzeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=quattroruote+pdf+gennaio+2019PDF 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_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 18632 bytes
SHA-256: e6dc65538bcf380ac8bd9395bed26b3c6681b7904d458e46c046a21294c21964
font_02_sfnt_off000151c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C6 11080 bytes
SHA-256: 2d32ad70b0fdd6a4fbe92e78a525f7ce8c2f10900740025175e5fb2e5436c0be

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