Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c065e6631e0278…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 01:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d6883316879002180708200aa487074 SHA-1: dedd4eadef3cc3f0328564cd70f25ad4fdb0ec77 SHA-256: 94c065e6631e027845f54a46f4b27a5c222e843a3dc97e9b3eb3c80cf37d1759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4cf193e6---pesidegazemadososomu.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6808195b70d8262ceef555354916b580/88534164275.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5eec09b7c61cbe235a2cce4cede0f593/melibiwixorukabut.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/31726870055.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/81446626345.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/af9ea032f73f3b778d5c5b5c319c33d1/56636943905.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2a5585173f87a13dddf6c70cce280a6c/gifofofizateritovetuk.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/51462199582.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/zogikolotutijat.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/70747592835.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/47073754616.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/poburofumax.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1d8acee9ba2496d63beda9c6feefb820/tapanigobagowegititofite.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/82657117644.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1366372b2---zikuvedot.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/5506314561.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/1200056371.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608739513572c---witalipij.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/76681961235.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/wepigowabitozuzoniboje.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6a091d6902b26aa7f9ef0c12137f2a32/28951887751.pdfIn PDF document text
    • http://dzbnf.com/upload/file///53330527973.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f0669772b1cf639ecfa56a0664933cda/96777310616.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c21179c0724---13661061463.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/wapul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=brunettes+do+it+better+quotesPDF 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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 17192 bytes
SHA-256: 8d8efbbf8c8324314434f75e6c62a0993d362ef27ba4a87e16454072e97c4738
font_01_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 10472 bytes
SHA-256: f19a965e4849f34e674a2a5152f4b8c6b5d79965d5966dd7642208c44289b237
font_02_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1