Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fd514cb4937d2f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 00:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2ec6a73e8f593ae0762d843d5860e61 SHA-1: d10d3d1bed176380ff76eef5425e377a74511b86 SHA-256: 85fd514cb4937d2f8914db4082cc451df53b957f990235b85a5b7ccc9706ff45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or redirection strategy. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content, likely for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=yaar+anmulle+returns+full+movie+download+filmywap PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7a48293b866e0ad6650642df36005bc6/zutevexewaxupe.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sopovatidovaduzevikaved.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/48089304721.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/saxopigasufegijozoweb.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/58374004717.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bb84bbe3---8353784793.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613fd9b46f21d.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/34197533037.pdfIn PDF document text
    • https://webmenuplus.com/images/file/junibel.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/23167868688.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/12206167034.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/38799274283.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/64c7aa511d4a10f3d9f6801d20953200/43920053493.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/92335623447.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/12729217629.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/72152588626.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/febojo.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/76697403574.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/81601420445.pdfIn PDF document text
    • https://kawanmto.net/contents/files/90741378206.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/26004217154.pdfIn PDF document text
    • http://gapp.fr/medias/files/35868702636.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/66870078438.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/25963926637.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/xoritubafuf.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/marinakadem.pdfIn 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://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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 17140 bytes
SHA-256: 6cc9f4e4ff2fe5aba35c20bb95e4b85c57b762e36618db2500aea11115262814
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 11008 bytes
SHA-256: e836ba53c821a35f157bcb8734a8ca16b7f80d5d115422084aeff771e171f12d

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