Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb925db2731d6b8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 07:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab2c7fa7a670f35c7f2bd6cb7e439b35 SHA-1: 7732f00f4201c911c36f44ed06de759183b58672 SHA-256: 7bb925db2731d6b8a6805ed0f9531c995dff1eef167e127c0bc8dfc357779f66
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 part of a link farm hosted on potentially 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 a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=can+you+download+android+apps+on+fire+tablet PDF link annotation
    • http://nuovojob.com/userfiles/files/24188267201.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/goxunedizezuxawopilusanen.pdfIn PDF document text
    • https://schmitz.cz/res/file/xudonamevotawegawoxubime.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/kapewe.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/lirevesanasusenadurugo.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/37693923848.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/29082147577.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/mudiw.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/vaperesekezazofevozodopa.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/rapesisogapofokokeru.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/78317601011.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/72735513300.pdfIn PDF document text
    • http://perksys.com/userfiles/file/nulafovepolisonabane.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/buvovabopozufeme.pdfIn PDF document text
    • https://totounited.com/contents/files/68350744670.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161336c6d0bfe2---muziku.pdfIn PDF document text
    • http://373113.linker.tw/files/vuzoxejaziwijol.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/91444967571.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/xinirojevesifazusubusav.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/1300895639.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142578af3181---dadijaresavi.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/siwubuxedasenalineze.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/kebakorasetelewomewegif.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ea26ca1---35893872148.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_off0000b7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E3 10960 bytes
SHA-256: 5faf385a8e425507de77485dedf4e4a83a2f65b97470ff294ca7b8aa18161a4f
font_01_sfnt_off0000d14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 16668 bytes
SHA-256: 8610a418cae85a213124f09e731b10d93a53af506ab71d6e5a34a5082e1cdb77
font_02_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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