Malicious PDF — malware analysis report

Static analysis result for SHA-256 216334d0db12d6c2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 03:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d960e3430dc19cbc6cca65852a98b514 SHA-1: 1aa55056c10f37c30dc8a59962274e7306fb9c13 SHA-256: 216334d0db12d6c2ef11a4b1143b3c1851d45ab2a1ad13122b05f09b3a9fdf7b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm on potentially compromised or disposable hosting supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=words+that+begin+with+long+o PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78c33d44b---nedugumifisosi.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109072123597768.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gofinaxufetijalufono.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/lununikilirozuvezoxesefon.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/zikute.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/fiwojezofimimep.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/tovirafevexajowanuponeli.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/62898820117.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/vixigajufazak.pdfIn PDF document text
    • https://arerp.kr/data/file///70345981482.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/jigusekowupuwujuzumuvam.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f268e2a4119d38c4b3470cb5c39eabd9/migomodaka.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/22550611186.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/jonodexawenawatinaguri.pdfIn PDF document text
    • http://eternaseguros.net/files/files/leximafa.pdfIn PDF document text
    • http://opsir.eu/files/file/4272128906.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/93393670279.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fupego.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/45383363518.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/28760329828.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/fomukuwu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ff8607b1b2df85b9571cfc4242425332/22860296895.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/81892052148.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/3774469693.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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 10744 bytes
SHA-256: 2fe79bf45426d944f285ab8f325c50cc184775160be1cf505963e2149cc5972c
font_01_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 17448 bytes
SHA-256: 4cc9facfbb4adb6bf3db99f393b9642988c22bc4fafa63a94035c272ac098996

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