Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c60ca5a2504435…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 22:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c71e708f0b5fc23addd9cf1ad4225d5 SHA-1: 7de87552dcf42e056c626656028071b06f7e84a7 SHA-256: 91c60ca5a2504435dd3db09cb428cec5d1b11b1c841f298e9349dcedb9858ea1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=knock+screen+to+unlock+android PDF link annotation
    • http://www.sushmitamukherjee.com/fckimages/file/5615140114.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a498bdc3---65633713595.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/74544645716.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/53207787158.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vogolepam.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395552d92a1---87486316952.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/82930703007.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/gupasomeladasexalezuk.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/65916266627.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/84676881597.pdfIn PDF document text
    • http://short-story.ru/upload/file/84956121040.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/81580378705.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/oripacff3jafsn8tpijol6lan4/56379858155.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/81909084985.pdfIn PDF document text
    • https://mahae.hu/files/files/26150938784.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/80655850319.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/parasebegopuwelapugeteve.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/21141088335.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/95410012792.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d95964672cc07c5cdadc95b58dfb7a8e/4250271061.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/zewakuziz.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/17343057427.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fapamivaxibi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/49662358221.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090917511773499.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/lobijebilosowuvutujimure.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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 17988 bytes
SHA-256: 589730ab87b7053a266d7472fc7c1ad71011b2228b6b7166e7a295dc0940187e
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 10548 bytes
SHA-256: 192a3b0c92f066da9adca7129af15d1e3d878e58a273b447031d9e553f2b2219

Open this report in the interactive analyzer, or submit your own file for analysis.