Malicious PDF — malware analysis report

Static analysis result for SHA-256 3468d80b5749d9b7…

MALICIOUS

PDF

71.4 KB Created: 2021-08-23 13:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d51e16197775825831c0309ad7024a8 SHA-1: b0bd08ab45c927d241efb7bd9af2a599db9f9f2a SHA-256: 3468d80b5749d9b76f04690e4a1d94bba348c5635ebf62cd2407267240f9f4ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zniczekowalczyk.com/user_images/file/36730349813.pdf In PDF document text
    • http://cohensevents.com/clients/74638/File/kutuxubela.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4cb22fa5---57859174753.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54939e0cb---70046048380.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/uoit03vb3el9ucvfo76pldfcos/wusasi.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8asn8786if9098glghe3bvjlg8/55396247419.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16290565893635.pdfIn PDF document text
    • http://hevolta.com/upload/file/30789155376.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/kotasidosovezasepibimez.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1611986a0e83e6---pivarozaziniw.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9adebd4f51e2a78fbbf18100faed2e6a/parumikiminaf.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/k3dg21crb56rob385u2dofu3u2/76774372681.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/tejugejokex.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/88302763889.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/apiqhilsa8bhnnm7j2dtcsaf7k/wowuferusonosikifoj.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/vofizupipefevarevugobazi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/moxawav.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/raniruzegomufimepuraseto.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/93129630155.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/dugubagixifad.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/28444427404.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59b0b14436---61280487984.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210515020242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=html+interview+questions+and+answers+pdfPDF 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_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 11048 bytes
SHA-256: 0d9f47b350d92f6383d2f023cc2986e9597c7d8daf29ea8e36b5cd5a072c6dbf
font_01_sfnt_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 14444 bytes
SHA-256: ab7268b93674565ec5cda748a94d1098c2fb1a375a24945f5439015473ab5ffe

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