Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11c57b301703017…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 16:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f11e729b2f71850021c13073f772cb5c SHA-1: 7d2c4fc9bd2b4f6fedf5ac516b7974cbd58c4310 SHA-256: a11c57b30170301773aceaa486c5c4b8c203a1b3101ea66e85cf597382b13543
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a link farm on compromised CMS uploads further indicates a phishing or scamming attempt.

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://allytemp.ru/uplcv?utm_term=terraria+full+game+free+download+for+android PDF link annotation
    • http://yoshitomo-kokubunji.com/jcfiles/file/8442920283.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/50654475117.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/56397554990.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc8b8e4ff---fanibefufibemirinopozuxog.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/75707042698.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7717d4173---63995953114.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kumurewokilajabekofib.pdfIn PDF document text
    • http://lex.tj/img/file/zubuxonatusoperupadiladub.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/92889790726.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/64253347052.pdfIn PDF document text
    • https://deepex.hu/hirek/files/7245295431.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/34022119769.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/ziliriboso.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/41215385768.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/fitowaliwusej.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e4b8149c578dc9730ddbc659b157fb58/38677655817.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/gazexijetowigujimisudavis.pdfIn PDF document text
    • https://majubesar.com/contents/files/wudowuz.pdfIn PDF document text
    • http://aimic.com/userfiles/file/76119437446.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c5e38d2e---bafepanumavufugugusiruje.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96f653f58---zaxebufuvodujes.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/ligeriwadabe.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/zanilemadonewiza.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109111247348377.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 10580 bytes
SHA-256: f8f089d0f737cb3eab384453a83476674bffa579c9ce6ac6fa755f8a0d85a8ea
font_01_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 14584 bytes
SHA-256: 260738349c2e13ead4fa813a3fb4d0f14f8cb488f0ba6ccbe2ee96040caf21eb
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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