Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3964804ae00ed5c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 974c449bf22298337a7ad6ce9a475542 SHA-1: 65a4936c559876860c92f7f1d7cc07465232a725 SHA-256: d3964804ae00ed5c4b0dcf9784c803d80af4a76dcd56ec0b1874ff2dcd382a30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised WordPress installations. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators strongly suggests the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=best+mobile+games+under+500mb PDF link annotation
    • http://goldendazzle.com/upload/quangtri/files/ribexagikevugofima.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rapefoxukebibuwatul.pdfIn PDF document text
    • http://strahyi.ru/images/file/levopawadi.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/bafakamukizotivotorazag.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109191020491888.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1111491805613d4a4a8a410.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg633fvp5loii030gbdbucgt04/12232448251.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/27622609742.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/78514065440.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354271eedd2---13396675649.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/laditigudapifafitabizexu.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/78360473315.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/58169334607.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/31787592491.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/mufejixisirozelodivu.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/63024052487.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/xapaleva.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/89952353270.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/5784188292.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee032ac0c---88466046674.pdfIn PDF document text
    • https://norservis.com/files/files/79786441056.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/26456952706.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161412624ab9fa---79051861979.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/17329432383.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/44628809347.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_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 11140 bytes
SHA-256: 9c6c500f77f285a6ae5e5be4b06018b202aa4e0e64370ba0effcf8ab8c5243d6
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 18080 bytes
SHA-256: 2c8c98e1ae438e1fdc3d548b510abb431a5a4de5b867a9ac4ccc7c59757eff57

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