Malicious PDF — malware analysis report

Static analysis result for SHA-256 2494e7ab7d824ff3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 05:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c1ce47e4b949e15900e09fad24359d0 SHA-1: b1b09fc1453de01c2168c53acbb0048c3b71dc1c SHA-256: 2494e7ab7d824ff38406e96fd6c3aa668c3589710a8e65e6529b2fbc6fc625fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress upload directories. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://rux-thai.com/ckfinder/userfiles/files/16779759259.pdf In PDF document text
    • https://path.mn/userfiles/files/bozomulivimif.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/zonevijoremawafo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fe2522da---zesidulesenal.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086fe5e27ff---rexevudurotu.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/78855255470.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/795309319.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pogadatotaket.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3b96706faaa28164f25abf89cf96d2fe/xopaxotepatil.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607777f3be247---tukojumejozuso.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/naxapalemamuxug.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/66702082093.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/wurusifunurebiposad.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/26713547253.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9be3c5d74---65546108881.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94968c66b---9055235340.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/xufubiwarebugo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab277cb7984---18384534144.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/libafutobukufuxaxuvovema.pdfIn PDF document text
    • http://cjatkinson.com/userimages/kaxakapixitajizofexulitaw.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/3841758680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+are+all+of+the+potions+in+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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 10736 bytes
SHA-256: ef89a6de6f907bd7d908e446623933083a649f4f82edb93b6282d0ecfebc252b
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 17360 bytes
SHA-256: 45bee56cddfae55708f4b4bff8cdfd0a0bdf19cef252447464a9b535dbd311ea

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