Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aa97bcd0266355…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 07:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e250e17ada5a790339168ae13a4c470 SHA-1: 873f1dd6ae08d21bf5cd543322964e4261b69896 SHA-256: 73aa97bcd0266355412cfdfd7c76d57fcd1401ef50b94ece692d2e7075207f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a7ae528b3050e0c410e7cf600caa441/luwetewajumotuwifi.pdf In PDF document text
    • https://internationalmedia.com/userfiles/file/jojitimawofofegusejakog.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607879e349050---38607522076.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/88836281160.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tizapago.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/d5l9mqda0bh79p0g7hseao7jjl/20828007784.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/37327846509.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0db059309---sexaju.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/85887629551.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/sulogurunoxexumuwu.pdfIn PDF document text
    • http://contactconfiance.com/files/files/xerogozolurij.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608429602f54e---60387240516.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2b2a87cd---92651361223.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/68503118610.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/gaxamu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5df5bc9c---nomor.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/nexalomajivepinimunuker.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/44247071774.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/54988597693.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/davejupovewojukopebotute.pdfIn PDF document text
    • http://projectcom6wrk.net/ckfinder/images/files/15270895417.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/89esd60lf1k6h9l80cl4fd99vf/21049429173.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/6380426664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gseb+10th+science+textbookPDF 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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 20768 bytes
SHA-256: 77dd8b2c704184537733549239793f6029e90d9e629e0d5395ee3600418dfb22
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 10568 bytes
SHA-256: e4c65a57782e22ada5f52fa99db8628a4241cdedd4561904f40d7442542225ad

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