Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5d4b439771c761…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 03:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c744c87a95c93b7b4119e8f9156fbe24 SHA-1: 5a9f0045ef74be0dc160175e18d06f3612df1200 SHA-256: fc5d4b439771c761d397a1e8f1142c983ff4a4b41b4b3403d469b90b917fd487
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious sites. The embedded JavaScript may be used to further obfuscate the malicious links or initiate further malicious actions.

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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vbmg1ubprv1h063mmr1g6vi2i2/netivini.pdf In PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/buzodaw.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/cfa791f84722e8ec24135837e5cda871/petele.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/joxofokudufobuvudovid.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/silofexezuxuvidufebodo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/51132110474.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b961cd86---labosiguxelijenilin.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/88470534757.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ad4bcaa13e91e2b9121ea225346e096c/kazupibipodor.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e9ae91171---57680498887.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/80694379941.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u6s5vt2aas0grp5mjb4ipa2926/lozifemetig.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098331d98432---tineriwigerunojuvi.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/53959356274.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d3f7e8a3be1595433a9128238f43ff1f/gapopoxoterawutumojex.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/zowatemunavakatozupowufa.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/92312408675.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8lnqp9omojekhpqlmajohpf6mo/39500582908.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6ada7e2f57ebdd52cdd5d874f8fafda2/12275017844.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ebdb8b4d0d2763d01cd0609ef91639a7/kupiwenizob.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/720ed645ed4370b3c23759e932e83b96/6924509265.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b0131a700cadaf2dd7dcd7a51611ce80/zebipewo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/wagoripov.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0l3fo4kik5n8djccv7iccj4doi/38491927474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+blood+out+of+car+seatPDF 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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10772 bytes
SHA-256: ec41f2f137855f69e3ae1a6d46ac4881a53d4022d8148424ea07f8a654346ba3
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 16716 bytes
SHA-256: e0d2c64b2a65f0ff73e1adca051042997ef3dd54911c68c6b6db2da026c7b0e6
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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