Malicious PDF — malware analysis report

Static analysis result for SHA-256 08520f3cf6baad7b…

MALICIOUS

PDF

184.7 KB Created: 2021-08-08 18:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74ec45679c86a7d63d957f76266e1862 SHA-1: 90633bc63f4feb64ffed2530f35abba97bb63ab6 SHA-256: 08520f3cf6baad7b0a9fc98239020f4a6a24425fa063eb76212b4f52c7fec23f
156 Risk Score

Malware Insights

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

The PDF 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 URLs, some hosted on compromised CMS platforms or disposable domains. The document body is unreadable, suggesting it primarily serves as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://say-international.eu/userfiles/file/xogidawawikosolapadewora.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dtlli92gphai72ic2gc4g8cumv/valadidufeguminezalajemag.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/32134375163.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/21/files/72964519735.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab376696443---31769615928.pdfIn PDF document text
    • http://yilip.net/userData/board/file/2363035035.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/27557215183.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dizofumuvipobilim.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/67351668454.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dttcmbnvjrn2mq22r6s05h0haa/buzejadezasemibonar.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/e69418f1ed052fef7efbc4d95f79a868/digusu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b1913acd---tububebigotupifisulob.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd52a503fb---xewuvomireposelonipa.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d75ec5df---zavakotivulosedixamotejej.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210607_4799E59812055E40.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d98c7151---66504553951.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d882758895f611c27c355d423d57b448/dumavoxarumakifuj.pdfIn PDF document text
    • http://asja.ua/userfiles/file/37220657284.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/33643313718.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/95477561685.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607a167059f66---lonowijabididasito.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e976489bbc8---vunegasitem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=thing+thing+arena+3+newgroundsPDF 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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 10800 bytes
SHA-256: 5d9bc5d0eb1c1e79d59de9169c22bc6194dfba315619960df71d0b27f87d81c9
font_01_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 154436 bytes
SHA-256: 920a42a9024a0d8b9eae584f67cc9b4735559569b72cb301bcaecdbf7f0cb994
font_03_sfnt_off0002a607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A607 16860 bytes
SHA-256: 86b6ca1e918720d295b05fe4f750c70f275e55db8757116b4a54794a294c5d63

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