Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f1d9d9900ba743…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 01:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ca8350ca354956ed8931136e5293ba1 SHA-1: 3e7b86104c8ccc2cb22930f23017ddf0744f29d1 SHA-256: d3f1d9d9900ba7433669fedc20a06fe1f57fe6957e79b99cb817f49d29507f3c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=android+car+games+apk PDF link annotation
    • http://dkkarsin.pl/img/upload/files/74066434569.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144723175fcf---52063625655.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/17263815276.pdfIn PDF document text
    • http://juncheng.tw/upload/files/worirarefilopajodal.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/23907171018.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/sokegukutegesiragefix.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/tuzigalokixutemuvonewalad.pdfIn PDF document text
    • https://andhimazhai.com/images/files/bikavufunopabijeze.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/77144573365.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/27123510670.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/ziranufimeminafuzuji.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/litajifasokepavavowuwej.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/xekudumalejivaro.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/17442074805.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://myxroad.net/upload/userfiles/file///tugexor.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/38109387501.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16143760893fd3---35957418141.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/43283376952.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161477a50758fb---71178411446.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/21145887054.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/30403600492.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/644448db86e09ce7845759959f7322fc/kenulapefu.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/63751232683.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_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 17608 bytes
SHA-256: 0f60b5d1f416a6bf3bfeac8e8ed47b73a6db251b2967f718e339fbf54b0d6be1
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 10788 bytes
SHA-256: c13806fda2decf6ff8688de2afe15d9421afc374a81ee093f9eb3c7aaf152e52

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