Malicious PDF — malware analysis report

Static analysis result for SHA-256 1872926f046959bb…

MALICIOUS

PDF

144.3 KB Created: 2021-07-14 09:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 320f37822167ed5590e9a916d8e55e23 SHA-1: 177197f2705c56866cec17e3e8be1e05f20e019a SHA-256: 1872926f046959bb17747aa1ff026606e27c0b43f7c44c967359ec2eaa2aa630
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://birotex.rs/images/files/tusivovoxopubilu.pdf In PDF document text
    • http://foto-klub.dk/userfiles/file/jirumo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/bufodawitigagejekirava.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vsfo553m6jak0rr2t28qqtbte5/rujif.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607840a17f136---56966710115.pdfIn PDF document text
    • https://bloomeng.com/uploads/56489736708.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076153f4b74b---66504415526.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8jpacf409dnc9fe37s3nr0iv34/27043517627.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/xuzep.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1858eb42aca524ca451b336b98494c53/84574254461.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cde3f1f7---85600843576.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4cedefa5fff66f998628d82b8fb91f6c/jinenal.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/wutulevix.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0ovk1fklqorv1sunc7dirdqn0g/90337612616.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cc97a8674b72bba0b4bb35d801c4a20b/44913788928.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7186ba3f3---satozonusiwexumovux.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/26950607082.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6cd069d2---ritokim.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0a20a02a---manuvagawexisidikulonax.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pj8gsjgn7de6hahi2k32tjj190/pevip.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/razuzosobasuwegofivafo.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/bowataxusedogarupilisog.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ap19r2ngnuua0e1mriuvg6u807/nediwala.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/32280237007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sleeping+18+hours+a+day+depressionPDF 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_off0001d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB3D 17932 bytes
SHA-256: 5f6b6b7421313132dc3cfd5d5342631faa964d7c991230d56b8394db8801134f
font_02_sfnt_off00021a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A06 11120 bytes
SHA-256: 4ceac5fa23ab2fc8a13c61ce5a0cd457754ea9c9985b60e8edbd37a90d4d7208

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