Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b56395c97c1e88…

MALICIOUS

PDF

161.2 KB Created: 2021-07-05 08:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10de1d4c97f2ea72606c15d081898aee SHA-1: 1d2a33c4cd99095bed6e012596d097eb6f8b786e SHA-256: 71b56395c97c1e88a91b9ccfd34ecfada54fbe4cec0d085b062345b6f2388c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=boy+names+starting+with+la+in+telugu PDF link annotation
    • http://toshiteriyakiburien.com/uploads/files/kidusukusorevibum.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/sukibekarapozelin.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pelonigenovajemapo.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/donatawawonulajuwasuda.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/515b13340332a683abd9c540fe3a30b0/66993033179.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/87198543563.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/bewotejupavif.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf7eb5da72---21920045449.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b53feecfc---27653031676.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/66446711633.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982847b011f---somukupiwuxunabujokesi.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/zivakabadis.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hvrp2t9r0feka4j580vtpmie23/sigeb.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097189f2d76f---14107826392.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/4219341904.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/76ee712746ee9d5777e798c1524cd35d/84978421555.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2f104c3f58c727b4a87566787fffafc8/xopefufe.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/752c8369f9dbd4988885d58217286e27/46677210929.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/18078926663.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/jobam.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/tk0ic7sbgtaqdclnoh74l01rf2/nejonopozanivuvikibuw.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a005c9ab---fivetimufifaru.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjvkbp4roaqsi93svgtrpvgk8i/24767445552.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fedc5b8f9---16024090537.pdfIn PDF document text
    • 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_off00021569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21569 10908 bytes
SHA-256: 2c0789569159672a4ada3fce023566ea84c77ba2f12230cbcc0f6f5798470542
font_01_sfnt_off00022e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E8F 18664 bytes
SHA-256: 5558e4fff160aebb8b3de860be5812393e4740f39a659522d19940dcddfb4663
font_02_sfnt_off00025ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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