Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c3ff4cb5e84622…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 07:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1fb55172193c791287f4902ad21d88c SHA-1: efeea48f64b500ffe36000e1bc204834728b4700 SHA-256: b6c3ff4cb5e846229f1c1a05d70471975a08f0fe83bce77c3335a2a0eca2e47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aumnat2car.com/ckfinder/core/connector/php/upload/files/gukowipev.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/61944577887.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/39425369984.pdfIn PDF document text
    • http://24cvety.ru/upload/files/firatidilulemoxoz.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nugufuvevesugofi.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/gomodufudome.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/408bd8f4d2c68026d338d2650810b2b3/wesenibu.pdfIn PDF document text
    • http://honda-vo.com/upload/file/dokojafivoworuwabixawokex.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/93217581514.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417ba22b5e1---25762725778.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161504fada9f52---tituroliv.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/89372363404.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d19d5f081---pomerelowobotumaku.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/towuf.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/94468741658.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/dubunevariwifagarajefeda.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/916bb02cf26f727dbfe02f0d7db9b5c1/2444470786.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/14498848878.pdfIn PDF document text
    • https://latework.cz/soubory/41757775020.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/samowapu.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/gekinipewejoraxovudit.pdfIn PDF document text
    • https://carlojans.com/cms/file/51912371995.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/lanedopizedigosinaroniwu.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901061748_732390968.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109050802161018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+football+games+for+android+2019PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EA 11352 bytes
SHA-256: e6f84029f34a4d9d43a76e0b96bca578062129677a99273b1438d32ea7605ba2
font_01_sfnt_off0000cd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 14580 bytes
SHA-256: 1aca9178401ead063e908a31b26b66a0c5a4ef0d469e607f361b8d85e634d7cd
font_02_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1