Malicious PDF — malware analysis report

Static analysis result for SHA-256 2104e9d08ef72ebd…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 19:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 95f68aa4e2d9a85f5ce43d6d619548db SHA-1: f7e64f9303f800e89dd373a491617cecbb3c25a9 SHA-256: 2104e9d08ef72ebdbe96f5b83de8324c5d81fe6970e57c4f50bf1195d8601c87
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded URLs and link farm structure suggest an attempt to exploit user trust via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cbconsulting112.ca/userfiles/files/58330740425.pdf In PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/27222720629.pdfIn PDF document text
    • http://hangquangauto.com/files/60958032575.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/pulinibozanikowujagofeje.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/48069489608.pdfIn PDF document text
    • http://chinahongji.com/d/files/xonezopizogipopami.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/dimorigurop.pdfIn PDF document text
    • http://retailcop.ca/files/pejubokoxigivanobamumuj.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89c2c3ff---jopeladadegukes.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/14677983962.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/nofaz.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/53034184584.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16153da8c9206c---nakav.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/63669513049.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/liginedidulewegijetapov.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/masisowaladitopalalavibi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142a62c2d366---65129749275.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/9209182582.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe86258a1---51016260903.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/pejuralonomefu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613009fd8ff80---nisav.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/butoselubunufodi.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/29709405409.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/59008568890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adb+driver+meansPDF 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_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 16588 bytes
SHA-256: 6dc731e5f6e269a66feccf8b14c75bc59b9020fde03a9e7edcf68dc2aff8535d
font_02_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10332 bytes
SHA-256: 8c7c70d0dc1cfef597d39955ffc45faa81f40c225522329f3f078f4825c99208

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