Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83b62dd8d653497…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 23:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f9fd401f5db5c0c145b113696d884c2 SHA-1: 91978f88f310e0767b252ee74adc6e31bcc1a221 SHA-256: f83b62dd8d6534970ef3a8c43a53449065348751464c6f6263764b8bb0b8c634
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://garglob.ru/uplcv?utm_term=how+to+win+friends+and+influence+people+in+telugu+pdf PDF link annotation
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/37080618892.pdfIn PDF document text
    • http://sswjeans.com/files/49835258597.pdfIn PDF document text
    • http://canadanur.com/resimler/files/jotekugurowu.pdfIn PDF document text
    • https://fultoys.com/userfiles/vevofisudasigagadiwelox.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6cj6agkjqlpopu4d5ostpnqa5i/22248336051.pdfIn PDF document text
    • http://uteambio.com/upload/files/62292440818.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/kumililawifitilagadofuwe.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/popekorisugikudaxow.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/joraworekogezesagududonuk.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/getosovuzasoxag.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16149b743389a9---musarofulaxilukovakolo.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/92957014685.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/l84mdvptetj7vda3emogkivqcr/kafadufamaxip.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/93563839588.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161448d6b593fd---sotubigebokatitifobewa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c68ed50da5---95025876548.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d09c38eac---mejonikilisubobiwasiki.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/notinopedokex.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/zetuzoxefumeburolulujegob.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/kuxobotisivowavupobubovaf.pdfIn PDF document text
    • https://fratellifurloni.it/file/65266773383.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/68852313252.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/89865593817.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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 16208 bytes
SHA-256: 297167bb168a7fc7d93565fa1b55a135a36f70201ea7e4cf1e4e6b2e7ebcfcbb
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 10972 bytes
SHA-256: e806390b408cad3e6144d5ef267040a757ee8a746bf3b5a4206ac8d5619add0e
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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