Malicious PDF — malware analysis report

Static analysis result for SHA-256 081a148887087df7…

MALICIOUS

PDF

80.2 KB Created: 2021-10-06 03:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90960278bb5a214fc06b02da25ad4ef3 SHA-1: 99b1019ac655dc3932b5b126b652a43e3cc27a2e SHA-256: 081a148887087df76e07a54e3e225a68a294979dcc6beb145c163b9fdab90ad9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be compromised CMS upload directories. The primary purpose is likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=swot+analysis+self+assessment+example PDF link annotation
    • https://icon-studios.com/userfiles/file/31297424650.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/2678919794.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c6f5f5ff08---sozitunaviwofinaw.pdfIn PDF document text
    • http://chromavials.com/d/files/53944200675.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1615951a0c6452---67660276731.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9b07b7444432e8fa6e4e327bc152ac10/wekolabewajara.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/69725640330.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/44995837901.pdfIn PDF document text
    • http://olympusflights.com/files/files/37020195689.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dalaxas.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f097d191db---55561545587.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c254ff18e5---mijulufasojafazerosase.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/60bbf418fd06da9c42de4ca51c46a257/wifadubu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/26886421171.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/95769931699.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/10268512640.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pejunanaxo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/mejumekosureb.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/948270518.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/22637587495.pdfIn PDF document text
    • http://santabruna.cl/upload/file/fexokalasodugasurewawimob.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/21431375042.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/23481014559.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 10796 bytes
SHA-256: e7ce9236d7c268b152c826cb830ebec0bc404612a91e83224bbde2622a413a7a
font_02_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 16536 bytes
SHA-256: bd24c9b7a245c0c2fd5deacac025ee1c15ade964e71e4a6f2d5266ce21eef4a2

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