Malicious PDF — malware analysis report

Static analysis result for SHA-256 da255e274678347e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 09:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a023eadd226c3118446af1506bcd000 SHA-1: 3f303c0b9820a581fef3d8633094a6bef4c81260 SHA-256: da255e274678347e7732df6ef5ce33c056b53f0a5b1eff3fa0cac9cab79fbb80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://chcial.ru/uplcv?utm_term=how+to+listen+to+my+itunes+music+on+my+android+phone PDF link annotation
    • http://go-pxl.com/uploads/files/37876111445.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/98328329670.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/gixadatipuxa.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/mekazamaril.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/82ae2021b43964d3cc6ada4c609936cf/46194297888.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150f90878f80---noporifamaxabufizufulemi.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/fupol.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210927151353.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9a78afafd---mudalepobo.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/86679968349.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/kijuvisafifa.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/fofazobugofalemut.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a46db2a3a4---solubukixevovadimor.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/gedibolorusilavevok.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/4089766554.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/4216790361.pdfIn PDF document text
    • http://szpk.hu/_user/file/37156532506.pdfIn PDF document text
    • https://premium-house.uz/images/file/16876893389.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/pupodotigipofomategibikop.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sojumoledo.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/371242295.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/sifanomesudisolanajizazo.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/21599487068.pdfIn PDF document text
    • http://cx-gl.hu/images/files/motuxifev.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/remigoworexivovig.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906203048.pdfIn PDF document text
    • http://rayanchem.com/d/files/37224229104.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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 18488 bytes
SHA-256: e2c7c10326df4414891a8af51115eca3db13badc5acf473a859bddaca90dd2ac
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 11072 bytes
SHA-256: 03319e78b1f8cb42eb171a1930fa335e3005f08d8ca234fa9f361497d02f9e1b

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