Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f2a7eeff857b63…

MALICIOUS

PDF

74.5 KB Created: 2021-08-26 01:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92c819eb117cba7bf1be9d3a17df947b SHA-1: f713ccdb7c590fda08a1e96e551b46b5a1711494 SHA-256: 97f2a7eeff857b63b44d953dac3424d6aff61d5b48e5c31954e590d3e6d162bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload directories. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=old+case+tractors PDF link annotation
    • http://52fotki.ru/ckfinder/userfiles/files/nesinokunirejedaka.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/wujute.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c7ce6938b352a4a03f066c77052cefd4/xesezepoxanezuzozo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/63963339100.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6b0f3a9d48d9329707fc74c80d337b43/68028261281.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/ganoxodasadinuralakibon.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8aa9eece6d---wijinakajag.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/jesilujevanosi.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wigizofomilazumisanugeru.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/k66r4ef8octvfh25al9fk3tc5t/55331037325.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/64638794756.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16107cfd0625d0---87478635730.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/36880635284.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/14779254214.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b55fab37e75---76264980344.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/61304feede54c1e4c98f2884565ce7ba/7895383366.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/84006010267.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/86290122459.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/37355621507.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/91566e76d949d8cea37f6bab86bf5cdc/nizatovodoguruzafawuti.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/makugekonekor.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9b6871397bf01095cb396353ec5f91fd/85806354557.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/bijiretepodetifafudowi.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_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 10192 bytes
SHA-256: 1e944c944218945ef6787b3ece696ba10f710a76a09d8c629c9144a0ef390e4f
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 15916 bytes
SHA-256: dae674e265964fdc9b4f9c3800c9244a56c0aec8d1eb5ac0f42ee40c2ec2409f
font_02_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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