Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d4871b1425afe3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 11:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 41c9f2d90d11795fc8e4489c283e2b05 SHA-1: 209b455e2b9f8a25cadec328d356abc7022be40b SHA-256: 36d4871b1425afe3d717696195241a94c16684fd97dccc86ffa8281119a076e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm on potentially compromised CMS uploads further indicates a malicious intent, likely to host or distribute further malware or phishing content. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ea0b5da25213f001545d5d572d6d8215/61483857343.pdf In PDF document text
    • https://robodom.si/files_vsebine/15037303385.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/37609814757.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/79384510975.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/28107881338.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vepewomigekonijikapu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613999ff0fc71---batesulunaselisitopulaxad.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/94999645092.pdfIn PDF document text
    • http://grimastone.ru/files/xulexuvonusadivim.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/666383921.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/tufanosorasetulumogoguw.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145a71f693af---54280696761.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/93031788328.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/jakitilal.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/jolesiladosekobuber.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/jetoneviteveberazekanujo.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/lesopa.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/rotonajigevorowiweluwexak.pdfIn PDF document text
    • http://mextro.de/upload/files/napufusote.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/muxovigeb.pdfIn PDF document text
    • https://tsolisp.com/files/file/fuvafarenabuboji.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/12071156416.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3e49gacn5cvktq8naagmck0sf5/7273871443.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/givumekumi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b76f8690e0---48278962078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cricket+streaming+usaPDF 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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 10628 bytes
SHA-256: 8c08d89cb97a077b5e488f7777ad4e7655cd3c42de37831bd28a17d978a68654
font_02_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 16424 bytes
SHA-256: 4eeccda0a597725734340c96fe39daee65c0deffc7ef0f3701918ab1d81c2bce

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