Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4b971271924ec9…

MALICIOUS

PDF

82.5 KB Created: 2021-07-01 20:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 643cc52c38b06567c8e398c638934a00 SHA-1: e5db40f7e890e7c44f4f4572b91f90f4485a0786 SHA-256: bf4b971271924ec91476d5f16852d43a3cf93ef251c47996b2878be236446b58
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous compromised websites, suggesting an attempt to lure users to malicious content. The ML classifier strongly indicated maliciousness, and the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=steps+of+service+for+servers PDF link annotation
    • http://alexhofford.com/temp/files/file/zinegizerexudew.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da10ca44a05---40567185369.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/depisazafomim.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/vukedutizojudad.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d6f2c2bc448812e8b647f92261a355e7/fumipasan.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098414da96f2---rodagoli.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d8dceb99f94462443e89f5cb3db8aff6/tirexujewegovudefes.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6erh88foth08nnboe1dumiol0p/17835569048.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a8a271a41538cb255442cd3afd9df37f/419830462.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/nupalenuvizobepuwinonikew.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a759b7b7e23---7585860253.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/bipob.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b856fb6a819063f77865f55becb20b75/wowomafuzuma.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078224fcf0bd---bunamiv.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/nozukozibozaguxoxiwizo.pdfIn PDF document text
    • http://thedreams.cz/files/falij.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25bf1fb5f---xelosavudogijufir.pdfIn PDF document text
    • http://focostrade.com/files/20210619150331.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/2833105992.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5091a1394---damazuwekegikofa.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/pubulos.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kunolog.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/68454926526.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8f4f1fcc048daeca757306c187c215f0/929055483.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 16972 bytes
SHA-256: 509e0f1f014f50158f372a816e0b25c93f2799f17275effd46a4e3e576853d84
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 10300 bytes
SHA-256: f72db320b914639c30e9b2f6714a2cab18fd64dc78bdd17a7076f26ca0a3b475
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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