Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab6064c3bc97739…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 08:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 559d1166f7754f944449fb8b10a1128e SHA-1: a48ff3f472be81acc55664500ab0345c8b86ad24 SHA-256: aab6064c3bc97739c95b32953c198d913c5a1447eda6f0570386b8c711334e6a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to distribute further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=best+juice+for+weight+loss+in+the+morning PDF link annotation
    • http://kstarsmall.net/userfiles/file///5133012391.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/taroxuramalisujivuvukuj.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/56468105100.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/170931388147.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b371284d4a---32786710947.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae1bd9cc4---23557328909.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mikuwe.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7e7d5182---wujikenivuro.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nebijixikefudinirudonow.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/67745765447.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/42324943324.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/51667287978.pdfIn PDF document text
    • http://195exim.com/datas/files/kanapujupobisonimiwosoket.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c42310169d8580f7b7f2f064e2d392d6/80868465313.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/tejijujogedezubebu.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/11808909424.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fodevegutojemozigenev.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/xumadag.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/58011778072.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/89566120929.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fcfe99700---76568949500.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/vepemi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7efea82ba---ruwusatorokawasil.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/15036057467.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2fv8ioteka3eou5uorjf14rr92/81820221088.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 17760 bytes
SHA-256: 69a1cc31bce32ce43d1da2d5cf3f3238264e0fbdde10edc5bd762d6db25fff11
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 10988 bytes
SHA-256: 594b67fb09d24ed4f555fea9d96da97e0e5e85c89abb84fe1d2a7a12429c0a3e

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