Malicious PDF — malware analysis report

Static analysis result for SHA-256 378a6c097c7d60f5…

MALICIOUS

PDF

108.7 KB Created: 2021-09-13 14:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 666e2f0df1d7e11aa6a7642d3683f0ed SHA-1: e17b238eea54d251fc62879ac775417a76ff6f77 SHA-256: 378a6c097c7d60f57e6495b58244b2655284a6665402288a4891885b67a2be1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to external sites. The numerous external URLs, many hosted on potentially compromised or disposable domains, reinforce the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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 http://itcck.org/upload/editor/file/32578667122.pdf In PDF document text
    • http://ippon.lv/uploads/File/redarusuzejej.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a112ee9f42---96115814521.pdfIn PDF document text
    • http://art-ball.net/files/file/bazamumeba.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/27473a3e26dff6c52cca86fe2ff2920e/21440385859.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/64292077565.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/60215643132.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/84271401622.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rilogazabezazaf.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/85678498297.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/19411918946.pdfIn PDF document text
    • https://bczenekar.hu/files/file/84838729578.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/6124796068.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/483f5ef3088235994b14cde1b14ac2bd/lerotinexujuxiso.pdfIn PDF document text
    • https://photojet.net/userfiles/file/lakizurukutuxagonokizidez.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/fukusavibep.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b95edbcd---26610662746.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/noruziver.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/famoluruxuro.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/93ea2a51f29a7ca8435311170b9f7eb8/talubetev.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/mafutofuwagexot.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/kepakafadogofikular.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/59352971971.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/tedeluwujiminakuvosuve.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/robedes.pdfIn PDF document text
    • http://edituj.cz/res/file/83999390888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+ball+z+season+4+episode+27PDF link annotation
    • 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_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 10916 bytes
SHA-256: 2b5b66e11805a58bf281277e942c478fc781dcaac9dc2e8f36813af4fd9d2c35
font_01_sfnt_off000157f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F0 20092 bytes
SHA-256: df8682deebdd6117074ca092c185efc22494c3a1fa9607b793a46b2cf5641bb2
font_02_sfnt_off00018cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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