Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c502814a4ef38fe…

MALICIOUS

PDF

88.0 KB Created: 2021-08-22 01:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ab8da4f0a3b1dd4fd671d77f59b145c1 SHA-1: 77a2850f8c5666cdd1153cc8403299f285801553 SHA-256: 5c502814a4ef38fe4b1151b3baa196f5a2abd006806d6bf20dee09d8572bab59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the link farm indicate a likely intent to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://moriefrusca.com/userfiles/files/7358402050.pdf In PDF document text
    • http://viettranslators.com/webroot/img/files/tibapuvulenusukaxowi.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/76222813964.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tqjbbt5o251731qaa4hm7rjan2/povuvafixero.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befe98ed510---sutamubufivagozakire.pdfIn PDF document text
    • http://idroter.org/userfiles/files/91853825963.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/90170244171.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/76564324852.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/30957431f28965f1251bfd944e729db7/gixuwopekomixivegomelitup.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0de05bace5---kaxijevid.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zixonodanuxorezumobu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/54707216035.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/potibib.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/44306538965.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/74014765026.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202168258384168.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2395b220---zomivi.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210810_131727.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04fbd90ad---kunapotux.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0270ebc5---bidepabigiv.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/paxiluvarire.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087eff1804ee---kugifezegorox.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/40711980876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+online+slot+machine+games+no+download+or+registrationPDF 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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 17664 bytes
SHA-256: 01ea0de231d5f6e3b690e2813af8f128ad4fd20eba9a8d14106ba847f4efbe4c
font_01_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 10880 bytes
SHA-256: 4faf9faf0fad625eb308d5cfd3a25260fdea3e8ca70850a06d7d84edcd5e3da3
font_02_sfnt_off000139ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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