Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af024a99229c29d…

MALICIOUS

PDF

107.8 KB Created: 2021-06-26 11:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: ea9b7b1f86d75810a446d3b8d0a9bd26 SHA-1: 4a55dd972ad68245d548890baeba9706b57dc28a SHA-256: 4af024a99229c29d62c64700c6ed33dec8962c30ffcb030d04ce82a30aace062
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings confirm the presence of external and potentially compromised links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608138d240f88---55495976220.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/212b151a85575aeb45673dc73d3d7c96/jawarumogowo.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/7831806017.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/13bd22c901452c90a2df04406aa84d9f/wavizopus.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8ff0765722b2bc41b2f4a17fcc6d8cf/pizegaze.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/24639457931.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c862d0604c---40978095124.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/fapoxukofagusijoxesipi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc9b740f6---63296175052.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/lubaledep.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7c8857e83c5d7383c025176a510ad907/53738284524.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/tesupi.pdfIn PDF document text
    • http://veivel.com/userfiles/file/85620387788.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pixatosad.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fc0a240b---rusawutato.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b134bb379---rezumirokaderivitit.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaeb0d64bb---dogopolisegogaremowoxilab.pdfIn PDF document text
    • http://brukbet.com/user_images/file/87764067880.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6085aa35---24952862739.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/41356563308.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/33745253571.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ac273d40---nidezofemudazazefixuguli.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/lakuwukobefemaviko.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836dbf14dc3---noragiwidopuregavelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=marble+chips+and+hydrochloric+acid+equationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 17584 bytes
SHA-256: 08fbbe53075bbd4244d490e5d6829f0fba514413cfffdb9c9e4fc4b530059f31
font_02_sfnt_off0001724a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724A 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off000187c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C7 11104 bytes
SHA-256: 45cee260c2bca03f22ab2d6bf31741ce3ffa306038f3ad17f9d9caa00e113049

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