Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0616f42c751694…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 13:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02a511c417b3017bfd351e5a0cb87ee9 SHA-1: 6dac75c25f0b98fb77294188c11631fa19242a39 SHA-256: ab0616f42c75169400e5c8b8e478f4283148c18caf8c8d559648b05bcefd64a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb34f31820---43176271747.pdf In PDF document text
    • https://haisanquangninh.org/data/dulieu/files/90406020359.pdfIn PDF document text
    • https://desco.scp.hr/files/46444343509.pdfIn PDF document text
    • https://pindimana.in/uploads/file/likiw.pdfIn PDF document text
    • http://guchen.ru/d/files/9166729297.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/98592611457.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/45650418198.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/jamemolurufomusumo.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/tefuxuveporozifoku.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/fejivavet.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/67284316211.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/43778765812.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/21627694358.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ad0db820---kibabitododetiroxumofi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395128892aa---mapisebog.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/3588470778.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/81501056594.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/dixudufar.pdfIn PDF document text
    • http://koutingchina.com/upload/files/11032690715.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/57585294260.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/defawavavesuwukuwusawuwo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/76848940758.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/buzizagidap.pdfIn PDF document text
    • https://matrixx.lu/images/98403723943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a20+sd+card+slotPDF link annotation
    • 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_off0000c4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 16828 bytes
SHA-256: 884773572d318d7b829481c765dbe596f4f7c7a89b9b23e96c6ae472947e46cf
font_02_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 10256 bytes
SHA-256: 6013b6568c325b9d5358e05ede45c99193e0b25dcbadabdc54d2d4e1c4d6ec5d