Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7187c32a8562a9…

MALICIOUS

PDF

91.9 KB Created: 2021-09-19 19:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe61c71dd2d8e5b77f3be0ff071029cd SHA-1: 95d7a256d000eb776d524105c1383ee0ba614583 SHA-256: 8c7187c32a8562a931de430b5379e09f13a07fb16297f344680bf03a141bcf94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a2abdc7aeb0dd5d90bfd3f81f8652de2/vexited.pdf In PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/sagulewijem.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/89574977606.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/89776392298.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/86916789967.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/paloteriboxopoxoju.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/17001029304.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210909_013354.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/zeteguk.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/powalapiguzekuguli.pdfIn PDF document text
    • https://izr.fr/files/nubazijow.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/14511355287.pdfIn PDF document text
    • http://ahknchem.com/upload/files/95137138509.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ragavotudu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359dad403c2---dovazugizaj.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/93516646879.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/90957293418.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wazesovoluridotu.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/xelepolavuniraveto.pdfIn PDF document text
    • http://craj-ops.craj.cz/soubory/23130827383.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/98582794130.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5ddc99c9---34180018019.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xufisamegodola.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/7322596863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=1985+anthony+burgess+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 18108 bytes
SHA-256: 09d0569a126953577616297cd4d5d1b32571fecd21dcd8d44e7363d2277080aa
font_01_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 11456 bytes
SHA-256: b05f0465db08071f896f4486c3b18f849bb4c01f5a88be40476b6474217204ed
font_03_sfnt_off000146cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CC 17828 bytes
SHA-256: afde470e6ac05241d8b69f3a8e2999f119d25bb21020f77d07bb4ada4754b032

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