Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52cca97111b9eac…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 23:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb27502dc187b48718b51736b148a513 SHA-1: 0a50f221ef011eca837965ad214beb65ece4c885 SHA-256: a52cca97111b9eac6ec3a09e6861d4fba3c4b02807da8f0b023826efbb5413b4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ambcavallon.eu/userfiles/files/2224011377.pdf In PDF document text
    • http://ukonlinedirect.com/userfiles/files/sigelafegan.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wagapufola.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/masepexizunodupupis.pdfIn PDF document text
    • http://poultech.net/d/files/lulozuvilamirejadop.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/lamefukaz.pdfIn PDF document text
    • https://micsys.in/userfiles/file/tukowodixugukerabenedeka.pdfIn PDF document text
    • http://adveotec.com/img/file/kejenatexisuga.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477e8b26ab1---toluwatopevut.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161300efdc7091---nodenaxurivoranu.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210914020457.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/sajanoxuk.pdfIn PDF document text
    • http://muszempilla.com/files/file/26509072704.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3fae6de6---48523549101.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e106812e2---36012696938.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/14278467600.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210908041649.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/82040953812.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/59948984402.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134022cd3db8---17872259192.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/56560458670.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/3263747214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+emulator+for+android+appsPDF 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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 10812 bytes
SHA-256: 4a8a985064b985bf7df5b330a24be068a52d5176fabc1aa2383c464b78dd9714
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 18056 bytes
SHA-256: 64de70c84b34da70fd905011f1f5b0a87b794f0a228219a4f5facda7a86265e6

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