Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc7f48fb0deb200…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 13:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c09d89511a59fc4bd09c048a526c6dba SHA-1: 6e63e4d15f00bad7f22e8deed35262c281973947 SHA-256: afc7f48fb0deb200a3dae3e247f47cd95ffff76c4973ceadf238ee6ef404068a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+do+you+send+your+location+on+android PDF link annotation
    • https://nurea.se/currency/userfiles/file/31640446805.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jln5477v34oemld45mge6p0q5s/37687568524.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/51878570026.pdfIn PDF document text
    • https://tivicom.vn/upload/files/rufobunixunefozi.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/37893039963.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/gagaj.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/26483562827.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/xobigujederipos.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/21936828985.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/65335938748.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/21271077007.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/ziramewupifubigu.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/8187379181.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/32690243566.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/99709709537.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/savenagopewefazutiwozup.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf6275627---paxutuzole.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/lejudogejomitimojaretapum.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6f36643.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/abd8e29165661d41dd9e3e27fcc9231a/95880376938.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/xumadipazubidi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/47312784778.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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 17764 bytes
SHA-256: 82239fbae997c1d7bef4e524a33a6fd5d732b8caa260a24254aa86aad705529a
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 10652 bytes
SHA-256: 3a536aea5197eb4ad8b435b9858ba19a61023ca59a8ba5da66e4eb4e4ed91e3f
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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