Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8107d0fafd2f75…

MALICIOUS

PDF

95.6 KB Created: 2021-09-08 03:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54e9e20ea56464af4b1797dcc101b3d8 SHA-1: f1be372351349681a462e094550830be32596d36 SHA-256: 6d8107d0fafd2f753f488575ff0e373841df9cc033c05d88faeb22106c81cbc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://sbox-technology.com/upload/datoteke/26819805176.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/putamonevazubosi.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995eca3c134---8288718336.pdf
    • https://plagij.at/ckfinder/userfiles/files/winodejevutofo.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dab57c3f53b---88663242077.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5d51c9428---sutogaxupaso.pdf
    • https://akapacha.com/userfiles/file/19021575610.pdf
    • http://studio-castiglioni.com/userfiles/files/80197018763.pdf
    • https://coonvalleycc.com/userfiles/file/41872647325.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2mi9u5sfo59ubib9tg6osb18o5/74417524292.pdf
    • https://media-get.com/userfiles/files/98845542143.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a0b2e8ac---nowafavevozel.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607374b28729c---79856988765.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03d1c8546---penigebosegusoxemivune.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/roledurexajixukijewog.pdf
    • https://whiteplacard.com/UserFiles/file/wujujilazaduva.pdf
    • http://handsonmontessoripk.com/userfiles/files/pofetozepodazuladu.pdf
    • http://littlepearlspublishing.in/data/eimages/file/1050325055.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/t33jjoq7aur4b6n46vnr34sfte/rofamugexikulutijekit.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbce116b8ee---44391603966.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/11652798606.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dce5a5ced---96931823259.pdf
    • http://inwallendorf.de/userfiles/file/42523527389.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D8%B3%D9%88%D8%B1%D8%A9+%D8%A7%D9%84%D8%A8%D9%82%D8%B1%D8%A9+%D9%85%D9%83%D8%AA%D9%88%D8%A8%D8%A9+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001226d.bin
8605cdb865c54ed7738d7f436142a63d0eac7a41d19015971f8e2ed06fb07571
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1226D 25024 bytes
font_00_sfnt_off0000d6e2.bin
becc046ace702d11732b294a44bc61fffdde3a9ab1e691e2d755a5cd906c949f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 22068 bytes
font_01_sfnt_off00010e8f.bin
ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 9372 bytes
font_03_sfnt_off00014e3a.bin
e3aaf968b5174239c5b312c12e051baaa62b578ff25430ae728e023239176993
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 18996 bytes