Malicious PDF — malware analysis report

Static analysis result for SHA-256 8352c09278bb3cd9…

MALICIOUS

PDF

74.8 KB Created: 2021-07-28 01:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63a608dc3e888ea90517be0f08b73495 SHA-1: ef5370bc1dff7febadf0eb51bed5e464734774f2 SHA-256: 8352c09278bb3cd92633d2faca49f98181799242bf5b755de76a670fd43c81f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains numerous links pointing to compromised websites, many of which host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7419

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a6382bbc5---lawexiturumopup.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8019109e9---berakan.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/084e50db98e6055e2303b4c223e762e2/29961841095.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/favatomow.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/65956237161.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9b02e4de---sejazijomijefuxawegobasom.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pebizupan.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/wilutidaje.pdfIn PDF document text
    • http://fruitvita.com/files/files/37815063422.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da047dbed44---tizejobawoxi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee993d314---99168584502.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wavixovula.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/84200553863.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a737b83bc9e33adac0ca7439d38e4fdb/93136479436.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a44b39416---53810721402.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53b2b66ce---51795312090.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0757bfe7---40296700174.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/wiserotorobexanifakas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e77050aa---midetukibakekevude.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a6abfd744ff4962c0f7c493a59962e0a/bobulod.pdfIn PDF document text
    • http://bakoca.hu/files/file/nobajaxukikal.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/wapovakifanevexigarexige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=domain+and+range+interval+notationPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10488 bytes
SHA-256: 102bf8fa965050a428017da43a91349e16c472be2af954161dca1fdb4f52b907
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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