Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a46ffe39fe50c0…

MALICIOUS

PDF

84.6 KB Created: 2021-08-07 15:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cba3b98d389b813d2adfe08bf403b1ef SHA-1: 571e468eda9b7235793ed309072a28a9a29b9bf5 SHA-256: 78a46ffe39fe50c044cd313a1834e5642caa04ee6c52639d8de1cff84438b7c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with a significant portion pointing to compromised CMS upload directories, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis are sufficient for a high confidence assessment.

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://asiquim.com/ckfinder/userfiles/files/lofikosopugalul.pdf In PDF document text
    • https://art4you.sk/editor_uploads/system/files/zazokixutiwivezilaramene.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wofurijosilogubeja.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609d119599911---98692000655.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/sotomowi.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/xefitirapijo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/85cf752db73961a648f4e326dcecc7ca/54372613907.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbd56685b7---zixixipesux.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde38b4e2b---522617526.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf662408e5---fatenuzijekiwujupajekowe.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/dibuz.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/xojudizabapi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9febb35c9e---rofafolizozikexolozaperu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/aa368fdf5f1133feec93668639cb2e9f/kolirej.pdfIn PDF document text
    • https://loctra.net/userfiles/file/66044666267.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/tidepa.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///57812539625.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c079e33a2c980f54a3d59088bcda458f/zunatiwuxa.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/geh59mlupg2hpi7qnn4kblcgup/83560502271.pdfIn PDF document text
    • http://nfc.soo.jp/file/wavegagaromamutotar.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051861643_369269340.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/13951471469.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/15459297368.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/besevufimejinogowaf.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e093b69a1b---98027577953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2sc5200+2sa1943+amplifier+circuit+diagram+pcb+pdfPDF 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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16660 bytes
SHA-256: 81e77deb6f7630b171a701f5e96c9951fcd8e8b47d01c78048cc05f0754c9b5f
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 11728 bytes
SHA-256: 52531873db684c3d4e653d38f6eb43f3ba061dffc1d674297d1f3598d4ef870c

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