Malicious PDF — malware analysis report

Static analysis result for SHA-256 5679843a7a246e1b…

MALICIOUS

PDF

188.7 KB Created: 2021-06-20 02:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6cd76b72946d9c4ffa2394d98051ccc3 SHA-1: 555dada1bf411e4dab20b1187e2b6a017faf520a SHA-256: 5679843a7a246e1bbedfd12ed710885630880b20e9aa30b620c5e60446b998ef
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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 https://catamma.ru/uplcv?utm_term=jumping+jack+flash+guitar+tab PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4894fc432e---zejigejijolug.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/44504983967.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe5f4fc10---lopevitodategije.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/63679678194.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/6736970090.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/joxobovoguvuruzanadiwir.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/49779405837.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4adf593fcd---92418310793.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/84482d2ca4a25bd19e0afcc6a64cd070/tasusigisalumamuwoz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d422d79b7e---57550352355.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/84102114499.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0841078cb9---21849476704.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/80190499429.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda6cd6c50---junanorurow.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/50ff7d3c824d650c029a29e7e14db920/tilerizuse.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/24405663746.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mj84n55dmt93t66222g527fd4r/vuduxekagatafikomevuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002aaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AAAE 5696 bytes
SHA-256: d73de4c7ebe2d6659f495d8d9ce05d58d79aafa0a2cd30bab20a286d92079ff8
font_01_sfnt_off0002bdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDEE 11808 bytes
SHA-256: fb988783c82cd9a81b50e4714c6fd3612c115708404e3890b37e03ff6c23f15b