Malicious PDF — malware analysis report

Static analysis result for SHA-256 09aa00af8bb37e27…

MALICIOUS

PDF

90.1 KB Created: 2021-09-03 17:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a55363a4376d9169c3b555fd7149f1fd SHA-1: 3900079f7ae07a6ac67e985927704dbf21e8a8b3 SHA-256: 09aa00af8bb37e278613b92542b0318944eba261b57a6d637f453fb875e93e53
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a raw IP address, suggesting it functions as a link farm or redirection mechanism. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports that the PDF is used to host links on compromised websites, likely to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://saksisan.com/upload/ckfinder/files/ripixaxeputokiti.pdf In PDF document text
    • https://bcm.es/files/galeria/files/dolimewukirexexoki.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/najuju.pdfPDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608571d17213d---gefetidixixibaloto.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071864b5f3e0---rirofodalaxomiji.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c44dc27f---66856307483.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e82c579d64---rakuwidimi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/31hl0mqoal0p10sfkv8s2rjegb/kafiwa.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2733ae3e6d---zagiriseziwet.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/82200031017.pdfIn PDF document text
    • http://punaide.com/userfiles/files/78827695422.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/pipavuguzaxafemipusesow.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/roniwiwo.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/bemerupatadezovurel.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f34f0da48---bixuzifigogixukovi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb1a01feea---fuzupomagavoji.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e1f6755dfe2b58de825c90ce9cf9c862/mufotavofulizu.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/fapake.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/kedekemabamulefevuwegone.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095d533950ab---linofunevem.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bab170130---kidinusav.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/buwunubok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jharkhand+map+district+wise+village+pdfPDF 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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 20488 bytes
SHA-256: a1908f5a0d77e4f25a50d86d5690695c821cb266aecb579e0b291b9b8efaf887
font_02_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 11180 bytes
SHA-256: 168deb0416bf48d33e3b7345e2d662e286ec0a5a13328662a1aa91777e7f82d5

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