Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3eff6f257750b3…

MALICIOUS

PDF

92.8 KB Created: 2021-08-08 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0f7535db1177cc7463843a407b5930e SHA-1: 51d881dc867202fb0726e35170b6eb3a0ce1dba5 SHA-256: 2b3eff6f257750b3530769ca84aaa8f27bed894a283f6b8e81b60f9ef775f08d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://garglob.ru/uplcv?utm_term=how+to+hack+battle+cats+no+human+verification PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b668cb6ee7---5943045513.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/94bb4ff81f63693b704391b5ad55d8f6/lisotaxavalom.pdfIn PDF document text
    • http://northcity.rs/slike/files/nulodus.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/jidavufokegogabena.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65ff63d9b---xosobel.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/lipaioh58aoibj764i2k1kvq7r/dukofefigemuponajitunil.pdfIn PDF document text
    • http://intergeored.com/upload/File/6023381356.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/54079865207.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d5c422de78f6ad2f9c367c573d58a064/dujekagidolixusezuredeto.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c316342fe---75342758232.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/zutikitasit.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/13409203042.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9diqi4rj010taa397gob5s1hi2/wukowo.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5aibe4ffnr9laporrqd0drrd0b/jedogabikexozumexa.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d56cc417fad---vapepej.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/vijutefosinurefiju.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/bisizeninowebugeri.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/25db52f4d386ab8f82885228b57be541/92480279531.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160783b37c7b4c---67812418369.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/minowozuxumesipavije.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c38f4684d---nokemametelifo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/446b6eb8e6b300f1bc937925109e1d35/18495716953.pdfIn PDF document text
    • http://skupka54.ru/upload/m/21032577375.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d5771ab8350937c91ec750252e8000ff/pulaniwokixixoka.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_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 18412 bytes
SHA-256: 4ce79b06489187f24915c6f5dc3e6b69ecc3c98dc5df8befd15572272af22848
font_02_sfnt_off0001491e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491E 11076 bytes
SHA-256: e41441fdd800278a775ee5c3d86628d9aac5ab87d4c6871d75ccfd85a0058d62

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