Malicious PDF — malware analysis report

Static analysis result for SHA-256 7846f9315f9aa2b2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 13:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1068ad25afecaec726f308814609892c SHA-1: 87ff75c0e28e6bc6613afca11f2fd21f1af6f256 SHA-256: 7846f9315f9aa2b245b089c83fc98c957ffb110bddb2ceb3681ffc978346c360
164 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by the presence of multiple links, some pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to trick users into downloading further malicious content, potentially leveraging exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f30777802300db38f0ad04a17829a0d4/likufaxefajibad.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/80509371425.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/gakukederebenaxumirefoxi.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/95731087603.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/76584338831.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/85823923905.pdfIn PDF document text
    • https://ikansambel.com/contents/files/88916408419.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rabedemizevoja.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/63091250329.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9cc7441b---busogikafofevoda.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/wuzudulanivirofafavanix.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vt959a9omdfv0h0qofr33eb21i/73634690474.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f829fd9646---desanevewurelubodigef.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/83616964041.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/zirisaxi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/55b583017ec99039b2dd2e079bd9bcfd/42302415748.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/84221437065.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16137909e273ec---87436525488.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/94666061573.pdfIn PDF document text
    • http://llux.vn/uploads/files/kijajagolimiwidoresas.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/7974059515.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/nuburajobomobeko.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5a6dc891---49117669285.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/91755156955.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/33647118447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sniper+3d+apk+downloadPDF 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_off0000c80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80B 10544 bytes
SHA-256: 7d1db66c8bfd0afce55d2192d81b4406b34f564987f7f42b7e229654a002a695
font_01_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 18684 bytes
SHA-256: c4862d06ecb62a0a5edf8a02c1946be7ee2771822b92b1f124537d51022481b2

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