Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a6e7d80ee74b46…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 07:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15e31e9ff048415c86c2d0b34fa39800 SHA-1: c2e438d146e854b4c759a3fdde06744060364004 SHA-256: 00a6e7d80ee74b46722dabaa5e311f32be2b6b0f0d6c2231170e87ee66905be4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malware or redirect users to malicious sites. The presence of embedded JavaScript and numerous external links indicates a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drentmedischadvies.nl/uploads/files/32526817457.pdf In PDF document text
    • http://alfavit.tv/userfiles/file/vepazoxavabol.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/63254202889.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/76b59d0b4ad1e8c89a43f5c5f84912ea/84731462244.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/lubamoduroxagokuvemina.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/41159308366.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/puranilakowalagolem.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/12100468514.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/7743853912.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8a778fe6---69659828577.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/lebomijuroziduti.pdfIn PDF document text
    • http://bankerz.in/qpic/files/19896121672.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pewiviboku.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/31193914400.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/70517345205.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078735c8f30e---93914349344.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/xedamemewubeloli.pdfIn PDF document text
    • http://yjccnc.com/upload/files/19583044980.pdfIn PDF document text
    • http://tw-go.org/files/65706318990.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f813e9262e7---bisanurifevonaretejure.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60dce12d1d---xowekifanef.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608353f505669---degedozumazuderodekenoroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nani+the+gang+leader+movie+downloadPDF 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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 10656 bytes
SHA-256: d41a8780658b7ee39ae821bb7c606be2e936582e92b7a79f1326f6bce95a62a7
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 17728 bytes
SHA-256: 36a0dd4051a73ee81f0e9ead51cdbbcd3155cc47d5ff080452579d8991a87499
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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