Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3986fa2c42f0d1d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 19:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82cf12d28bb465987cf9cf911c024273 SHA-1: 20025fd02517b2b40a2f412d6c740e8d38be5105 SHA-256: f3986fa2c42f0d1dc0de07997a1679884b9574f59804b46cf474eedb05ba6619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=wps+checker+apk PDF link annotation
    • http://rowadhr.com/app/webroot/upload/files/gegonafufefo.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/vemodofid.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_185553.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dosami.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/28779659487.pdfIn PDF document text
    • https://mediaskills.rs/files/47512814250.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334b868f1a9---30740346215.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/eafd155f27acaaff24b6e605b99e213a/54401180732.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9406e8077---benexikore.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/93368608081.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/melanobipamijezowokeve.pdfIn PDF document text
    • http://dasbluemchen.com/35680322967.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/ralugosefiboliwi.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/fepaxosezodifomobe.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/jodopuzome.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/92075215750.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/zejabe.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/50709071773.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/74480484612.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/ditofepasemosudezubo.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/37447655823.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/vatuxuxonagavaluzovof.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/lagamuturo.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/mezatugovanifebozupo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/42ioqede3dj3j08p8tg0iinvc0/74637127523.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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 17076 bytes
SHA-256: 0ac9f8b5ab35a206f9843be700f1ec65adac92f7459347b04f42a01447f07d8e
font_01_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 10096 bytes
SHA-256: 626504445d959b04704840852b7121e43347e0d3a6cb0a1c0b8299333a971574
font_02_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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