Malicious PDF — malware analysis report

Static analysis result for SHA-256 899178d97f8611a7…

MALICIOUS

PDF

123.8 KB Created: 2021-09-29 00:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 643749d5de5c4162eabc6465d68cdea3 SHA-1: ac9656ee5ec079a277d0718ad06d7c13f68c1d09 SHA-256: 899178d97f8611a7b8b9cc3df3081ee887dd1a82c436223826deee725eb32fcf
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it directs users to multiple external websites. Several of these links point to compromised CMS upload storage, suggesting a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://chalappuram.com/userfiles/file/71896501779.pdf In PDF document text
    • http://hak-al.com/resimler/files/31045047779.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/52214660147.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f7dfdc0ce24c1d0273f976bac58b7c9e/87188735499.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/7195273408.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/walaguxuwutedatil.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/zixabafasemokazerurokex.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/95069790411.pdfIn PDF document text
    • http://az-volnycas.cz/volnycas/fckphotos/file/sexibidaberuxajejofar.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/salonixuxodavupadomad.pdfIn PDF document text
    • http://crediramasrl.it/public/file/69965548043.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/wubebuvidadofokogivule.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/61545593300.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/55043520513.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/83646021735.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/wekobadirexofefanabonuna.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614daef92d419---zomixikiz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613265a1a965d---48499734628.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/41363957669.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/tejawen.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/25192136995.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/52094734019.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e809d46ec---baxuzanijiwu.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/ruvexumefodipitagu.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/puxodopanasevowafuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=yang+terbaru+dari+androidPDF 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_off00018179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18179 18284 bytes
SHA-256: 35bd27575965179f909d2efc93c29ffbab03bcc43af8df941c3a6223bed3a2ed
font_01_sfnt_off0001b1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9F3 10432 bytes
SHA-256: 2b3a5c331de902b0514574518c59d19d13ac2d0ba34fc1866e52f82147bb75e9