Malicious PDF — malware analysis report

Static analysis result for SHA-256 d146fbcbe8c36e6b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 08:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9ed4357e26293d43e430bc08c5f0ab9 SHA-1: 7af7a7c397c9770d658d2243a58d4278b4a913ae SHA-256: d146fbcbe8c36e6b8931cf3696044431ab51bec223a94fcca534cf6ebdeb3d0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://archism.ru/uplcv?utm_term=3d+driving+class+hack+apk PDF link annotation
    • http://prosquash.by/data/favikumujut.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda85c29b---65326704567.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/4302365600.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/81293871366.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/99535174492.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905135004763264.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/rumefodoxusuzovenur.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/poxovoxoku.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907181006627352.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/50262621921.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/65337172830.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/2489910529.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/xalibiroxi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b911153b---mamarevexisejepozenakimi.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/18335266983.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ab1f3ff6---luxazurorovazafotiribu.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/joguvipovibunifiwur.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jofedovi.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/xinoleranikunak.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a2091312ec194aa75aa59867e3860df7/52706071033.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/vumipabimakunenam.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210906_121144.pdfIn PDF document text
    • http://riversedgefm.com/files/file/sobefofetolezeso.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/95008967655.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/gajinejolota.pdfIn PDF document text
    • http://imoroz.by/upload/file/74528104702.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 16900 bytes
SHA-256: 1d34e1914f4837f5435172e1cf65faef706305cc44cfe8de393b46233eae0a9b
font_01_sfnt_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 10676 bytes
SHA-256: 6ce25479f9079bd9358b40abc982f2d4a212f8bc5e7d3e11035ff5e63fa7a650
font_02_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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