Malicious PDF — malware analysis report

Static analysis result for SHA-256 314a0a847910cca9…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 18:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38f5b06abc7a0fe66d3fe3111629c263 SHA-1: 65f6fc0fce4902fcff9434aadab38877201c0c9a SHA-256: 314a0a847910cca9606bc05fd54f2e6e489f3c1bf7eb93a5b78e4640103a4677
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.urbanwaterways.info/files/91119013046.pdf
    • http://energy-labels.com/userfiles/file/wulexisulabufiripedonoba.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/d5slp18u7oioolspa7unrb9ls4/63094177872.pdf
    • http://urduhadith.org/survey/userfiles/files/jusobivovikuzubiwalojani.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/kalizefofoxovagefefaf.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160866da1cee80---wawataxiv.pdf
    • https://prosperitas.be/data/assets/file/gudemulixojuv.pdf
    • http://atol-res.pl/uploads/file/gufumav.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/wujokubib.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e01034620---21849376510.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3a863748871aede4891d3c8e9162bf87/91691215686.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/f24008lhrm4pmfc7i3onkgmee0/36375815370.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9b228c6d5db528708355511f17dfdac7/jakimodukukoropusuzas.pdf
    • http://energo-winstal.pl/userfiles/file/96630425413.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/90a9ab21bfe96d4bec4281f199054389/47080451393.pdf
    • https://alnahamgroup.com/userfiles/file/mosofejunanor.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/108b82a6041bff815d4dc525197a9bb9/74295361256.pdf
    • http://markasib.ru/ckfinder/userfiles/files/30749437412.pdf
    • http://www.niziointerior.pl/upload/file/42148040959.pdf
    • http://montaze.org/democms/userfiles/file/29110166761.pdf
    • https://t2sc.me/userfiles/zuduguzabed.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d9030816---mumubowi.pdf
    • https://emilline.dk/ckfinder/userfiles/files/rodobamelojonalabizuline.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d568bee4c---dipodekebisoxila.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d504b96739bf771a2e49c15d44f6c689/sakijanuf.pdf
    • https://masukpt1.com/contents//files/50369836609.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=baked+ziti+with+bread+crumbs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16792 bytes
font_01_sfnt_off00010980.bin
cec193f98ca1a3ce927e306130da27c592ab0970bfda93b46d83ed236cd94183
pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 17656 bytes
font_02_sfnt_off00013713.bin
da6f75ced71d34ba13027670029d00f5d870b5c2e2fb851b2a234f664c04eabf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 10896 bytes