Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0394b836318d2d8…

MALICIOUS

PDF

87.9 KB Created: 2021-07-20 21:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7486e6328fe6efd68cd71a2ba93e53ec SHA-1: 3b96ff2e96975c1868b37872e35445abea150dbd SHA-256: f0394b836318d2d8add36bcb88c4415f576ca2a5512ce54b49bb7caa384ac264
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bortran.com/upload/image/file/20210531050343.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ee30a1b7baf00d3a5c66e4897a607dca/fisinepel.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zabalalexajixuzopupivobav.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/lojajisunimukef.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/jikuzipanezinuji.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/q47o392b0jmi4237kjo4pj8nf5/89464930729.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7vnughittacaqudhtho572sad6/33892826933.pdfIn PDF document text
    • http://msiutilities.biz/documents/buxuzifuvulixufolonebo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d0ad8bd438430d4a277a5a25b0b42a8a/dovulafawivetefera.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fbbkhgg5q7dhefphin95phd2jt/97890153903.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd660bc7b---57645466421.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27969598d3---melupesigowujusefozivoxa.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qm4c2g9hsu0bh6hvld99r8va46/kanubowozoxuge.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/lusovazigebamotijer.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e26b7e89f84---43828629255.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafb4b9f88---vaxogowozezokejopariwalet.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/jaderikonera.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/96883391714.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9r2fqhfhvecdb7oga827l0qdu2/41115777690.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/89647972887.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ee6c939e198b8703402fe72731566ffc/60607419189.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781207e08a2---92028465860.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7f1agnvlut6fajqgc8mol1bra3/xirugugegupej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=andromeda+tonks+fanfictionPDF 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_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 10664 bytes
SHA-256: 25d7a69b7691256fedad572588bd45f6f8cb348dfbb170115a318b684b006de6
font_01_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 16824 bytes
SHA-256: e27bf417329645e99e49c8197473dc179b16829a263222afbec34edf6073bd4c
font_02_sfnt_off000138c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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