Malicious PDF — malware analysis report

Static analysis result for SHA-256 b174b1c2f574a3c3…

MALICIOUS

PDF

87.2 KB Created: 2021-07-14 07:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07ba48a533eb0deef770e50793af2dae SHA-1: 8d2cb28959ce692dbd8b2f1f6482b9a92c6b5e08 SHA-256: b174b1c2f574a3c3a6ee8e864b97769b41c3fed7564942a63f7de2ba4f8802f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=how+to+change+name+on+fortnite+mobile PDF link annotation
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ae101bc340129299ab5345dc0c14cb30/84825032608.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/gelek.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089588a803cb---nakazirigitogesubenimibe.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/19238693685.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b37809e5c2fc7072eade5ecf7d99320/39436147683.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/boluruxefide.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/pprb6kq2lmrb4volpp925h7okm/laxenuresalobesipab.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050700013629.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/15360934103.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b601db946df08014242c491867598c70/89989865700.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a6bb6ec2---duresedili.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/s0kocmlbbu54e18ljqt44f03ve/31545238364.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7d86b7dfa8fb79132a9e7b1a89df7d1b/ruvukedowufida.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c68db83417a---33029745711.pdfIn PDF document text
    • https://tmtteks.com/files/niwojavajakorix.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d95bdd76d3d195de5963ac8a77af842b/46118974348.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73eea79ae---kunopa.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/767227972.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a21873d04---musumujolopusikinutawuk.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160caa6ee104a1---67026507654.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/97099407338.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2054be6082045160234b2cfd23dc6fd1/bimazagowabogud.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/98rn9126ntfeg5v7ol7qruv6sl/9392785897.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_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 17200 bytes
SHA-256: 72f189345a0ad9bd72c950302f538456a90dba187a7fe1b2472c6f3649f17bc3
font_02_sfnt_off0001354b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 10832 bytes
SHA-256: cb88fccd6a661049fc59cfb633a3aea3a54a085eb27cf3c087285f3c2f81b0c8

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