Malicious PDF — malware analysis report

Static analysis result for SHA-256 9139da8bfeca1e62…

MALICIOUS

PDF

92.4 KB Created: 2021-07-15 12:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c98c153e72936d8c355b6c82e4675e9c SHA-1: 604c9ef61c760edc7f64ce4831fbab475edf6811 SHA-256: 9139da8bfeca1e62316a3e973c02af12ed073fa691dca065f49788724a268f18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=frosty+the+snowman+and+rudolph PDF link annotation
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/jomiwovigiro.pdfIn PDF document text
    • http://www.toptehnik.si/images/80327310809.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7c608455c---wejagu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/895dcfc7b98d6e1c4f7878cc31c41336/42507771686.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062719431464.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1cdf9raeguhaji8v8g0384c0o7/15194465459.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f11817b9152d5f0a32e8fd3445b3501f/17857697808.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fea4ea2e2---37331031004.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbad10af5b---favipijopuniwoz.pdfIn PDF document text
    • https://777mto.com/contents//files/fovasatosefuwokutirul.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/24728126287.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af95246c56a---fonabizelul.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/jduc025j0qtgvksfqqcamuleq6/kejixofizuxasekeb.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/tapuzukakapuma.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/06ebeecdb582e2c4f50892f2a6cfbe86/87716214910.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec0ed6acb---tajavamipew.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160851b1bf0672---ponigujejaweber.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xupimevupubagediperemojom.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654fcd686b---nasijilu.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/labiwatuguxav.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ct8aqduc7ht0bsucqht7mi96rs/vurinezijivenego.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/96491408174.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/dilonetogepiwizazegaduwud.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_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 17352 bytes
SHA-256: 79c10d57ea1c27d8cc0dfabd802da71dd862b3a24a91651331c4eaf6f89a5824
font_01_sfnt_off000131eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EB 10844 bytes
SHA-256: b849e2e35854ac084228677795ed6591fb7cf7bdec94e342145408a5b6690e85
font_02_sfnt_off00014adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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