Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc69572645fdf887…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 20:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9176fee34919ad66956038b95fb19a36 SHA-1: fe7554da3575d418fd7b74bf0487442c9eb7f315 SHA-256: dc69572645fdf887998893068e58b70257cd6bfe6ba9f9b94e587ca2bb459ea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sibinetweek.ru/userfiles/file/waxepedu.pdf In PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-14/20210914013843386120.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/pigopewoka.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613558e67324a---59980092560.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/kizimofina.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/gelexoxopozojoloxolubepig.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/nejagasiwosibivudu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7aeb3a5ec5fc3e10efbea43f94cd48e1/gavuxa.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g70ircd3bjv36093rcqduqv8uc/vutuzapezej.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/sujigezuxap.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/lemawigovibabolalufefuvol.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/xutevefagaz.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/12867906421.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/71491186532.pdfIn PDF document text
    • http://dges.in/userfiles/file/gesemonilub.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/94805266252.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/331907c71940cb2f26cce1003e81dbe8/posegafominunesomoj.pdfIn PDF document text
    • http://coachhouse.info/assets/file/37021406444.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/63289228689.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a1a778ccf---26552596801.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/58748355806.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gozisufez.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/xewofojorigolexawupokok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=underground+house+design+minecraftPDF 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_off0000b45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45E 14896 bytes
SHA-256: 95bc9110bd277b807dc19b65b0130bbf8462d2696739b1a18faba82cd28a7a47
font_01_sfnt_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 10984 bytes
SHA-256: d365a1494635726ffe7f6668dae169c274640973eb506ae9bb0d61900e253c25
font_02_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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