Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14159234fc78658…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 11:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2500ee3eb6f710454968319ddb69dd19 SHA-1: 7db0473bbe58396e944718136ad66550a8e718f2 SHA-256: d14159234fc786587adb551d7c1f666a058b746bde34cc219134e23886262247
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous link farms pointing to compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/s78dsfq7e0k1vlnefov9unnmti/98264959908.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/13161601602f1bf3b3c04e7611d44369/vediluxurepinomarowe.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/rebalowupaba.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xexawidokamasexiboga.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b829e5f00---xubotugilowosebebubisaxap.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/gibipufonagorifaninorove.pdfIn PDF document text
    • http://parateam.cz/file/duzuliresegifomijul.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/18243232044.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bujeb.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/58086710124.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/48035326115.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/16840134949.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/bufepotapovuliru.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/80292775809.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256ff088f4---92978130343.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/117c03e6bac521298e39ce84e78ca8a7/63619611356.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/60317716663.pdfIn PDF document text
    • https://onlinendttraining.net/files/vibekimugoxunonu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/41619809177.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/4714959135.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/20501563701.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/81757569872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lost+wii+remote+use+androidPDF 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_off0000c592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC592 10504 bytes
SHA-256: 652aa123ea5caf9bafee8be29699768dac025033682efd4a03d19c88f22a441f
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 15300 bytes
SHA-256: b6791f28c1895691291516d7f547728ceeae8691ffb389cce8d71077799bd619
font_02_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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