Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee85d094a22fbc5d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 02:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8d64da5e1194606a4465ad75b01a0f0 SHA-1: 815e76a221b6d8c2fb3c22964a8efeb732f20008 SHA-256: ee85d094a22fbc5d0ea90dc0697d791dca1503a7fdb6a9afc70a5508d3dd12c8
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on potentially compromised or disposable domains. The presence of numerous PDF links and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or distribute phishing content.

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://yuktogel.com/contents/files/nozepan.pdf In PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/10467035011.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/xofudonevemozagegid.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/14165234758.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/19889025287.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/66163435893.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c778cc7cca---24638271721.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/27240402813.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/28937813669.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/14/file/20210914_163451_154.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/56679233688.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161404a653e352---wused.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/benojopopaz.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109172050214122.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614336ee9864a---19974167413.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/kapalumuzinazodabid.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/jgce12leakk45fj48upd282og3/tunirirabuxuxelisas.pdfIn PDF document text
    • http://dsfly.com/uploads/files/dalekubimozi.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/pijakupovegolemulorune.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/72276966088.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/22212699959.pdfIn PDF document text
    • http://sbairs.com/datas/files/nebomenuw.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/14113309273.pdfIn PDF document text
    • https://nistd.in/userfiles/file/vofeveleta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=god+kings+mod+apkPDF 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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 10488 bytes
SHA-256: 51ab147ef35e680cfaab861d14206ab2f2a46069b4d449025c972ed461c69264
font_02_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 17948 bytes
SHA-256: e4f1feddcb55efdba56117d4b95c519d7ad8db511259a3194cd90cd23bfce4b4

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