Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e955d6bf29fa89a…

MALICIOUS

PDF

93.2 KB Created: 2021-07-20 12:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fff3fa534bfa8aadef30fe3f0e86a59 SHA-1: db3ecfe9a9ef675b9b82af1b330477b83fd49c5f SHA-256: 8e955d6bf29fa89a8a59c17fe9632cefc2f819d1c9a906a74e7e97fcfc2cd78a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories. These links are likely intended to redirect users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c7eec2ba---74949724176.pdf In PDF document text
    • http://cuatudongbinhduong.net/uploads/files/38503405344.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kajafuzofoluzenavob.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160caf8132b924---wizuxovisugilut.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jj493f5lkvq8d6e0jgf5rsfqj6/rokipor.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/xudoxoja.pdfIn PDF document text
    • http://bronia.org/userfiles/file/74338001396.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e0c6f11b---nexijowidazawinenesod.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c6498b1a---fifuwilosumobudexiliruk.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd07d5b2df---26599642930.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecaf42c00---35551090571.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/fl8i1fkhsfi05vmg8kbfh61ll4/jepuguduxafikax.pdfIn PDF document text
    • https://airshow-bg.com/file/pasamojaremotubumukor.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nizarujobakumup.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/32832183676.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9be30a422f2797b1d5581bf4f952e6a4/89495401763.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/20662318782.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773691c852b---71112615216.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sewojaramavugurar.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/wokevenivojex.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/pumizepe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2f62b171---vonafipuwukarupulabur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=where+did+jesus+carry+the+crossPDF 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_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 18304 bytes
SHA-256: 90c827703808918ee1915094f1a8e5f415ebe293a07f7f8d936a5055da31cdfc
font_01_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 10656 bytes
SHA-256: 9ba67f866bed7c8bb5eda92ebe178d1181dd87ba2109a9569d16935d5a185c6d
font_02_sfnt_off00015012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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