Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7d2307a065c4d4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 09:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c572c2ce97e9a652284e4b3da3ad6ba SHA-1: 9079af01dae47d7e13618b46b51e02c1176c9ca8 SHA-256: 9f7d2307a065c4d4f49b7476d4a9ce3bb8c8c6bee1298b381e378c235cb1d4c0
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://cmorshomecareassociates.org/uploaded_files/userfiles/files/63319438596.pdf In PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/vajufivupelowedafa.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/gomuwoxubonalonenubukez.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/mulagodovuzufusolurive.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/80596710963.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/paluvumozawagadidu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/98022411790.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/61069640370.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tezifusifadega.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/70728697145.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/78924032866.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kujunatawinaxizewizopij.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7f86bde8---41383361846.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cb4q7d2nh4k2c71m7cm4f4hgbo/xuxagosikutenemegi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/peah7p1satmq9hkugvn0bl152p/rosiz.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/44844012943.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/57661487509.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/87599608074.pdfIn PDF document text
    • http://kco.su/userfiles/file/28845506789.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/411a0eaabebef89fe57b8d518d0e8886/fagefinimopakaluwofode.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/nimox.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/23944514025.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314f88c372f---6580766955.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/22529736769.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemerolixovumotuzib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=latest+update+of+redmi+note+8+proPDF 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 10876 bytes
SHA-256: 7cde384c751315a23f52ce6fffa97e9471ed3de40be21616f72d1e2e5b8b11c9
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 17460 bytes
SHA-256: 03f19c9b4bc1dcd1fa749b9e5634a74cf4e4a8965a6ed1883437507b6062d41a
font_02_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1