Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa127471254c6dc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f91cc2112926972525607d9259487a17 SHA-1: 9e489b34fae250ca157321f3af552cf197fda38d SHA-256: 8fa127471254c6dc23c2bb04cd917d30c10b27d2a02378ac3bbc0f6283ffc7dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, with one URL specifically mentioning a QR code lure. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=qr+code+reader+ipad PDF link annotation
    • http://konemara.hu/userfiles/file/tedozipasomujujaxumumaje.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/rinexokokawosegifirugi.pdfIn PDF document text
    • http://svx.su/ffile/file/tedowiruxakopinowo.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kegifokupofumizofiguju.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1vvo4r3a923r4n0mqdeb92jt56/luburoxizavilifuzelu.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/dusejodobuzorot.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/vikejitonakuwakarapuf.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/19830323502.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/81455225144.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/nenidenibelubuzeligodutap.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/50836197554.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/gojofawegakusituvaxok.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lodaz.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/48159625319.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135537f37c70---pamojesemabuwola.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/79533814899.pdfIn PDF document text
    • http://masonhn.com/d/files/42947131072.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6047b0d2---gezekisaz.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902142558.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/59873972473.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/virizidikivumilejamesuri.pdfIn PDF document text
    • https://dhesient.com/media/nodotimopilubetesowi.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tubumigejavid.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/47393159100.pdfIn PDF document text
    • 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 17664 bytes
SHA-256: 5f6d9a509e1232f5a87f3e8ff53c34338a3467a913a9f498d7180754871902bb
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10148 bytes
SHA-256: a6c2af877087748753fcd169785fc4d4961809031b3e90560b82e637fcd876dc
font_02_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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