Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b737d1ed1dcb44…

MALICIOUS

PDF

87.7 KB Created: 2021-08-07 03:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f319c8ea342c8ad136a8f4bc7dc5642c SHA-1: 918df6a3dd2a3a67b93471220cb714b01ede1f97 SHA-256: d4b737d1ed1dcb440d163c4110c2f0616a030a08f28928398190ff0db25d7551
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://coretry.ru/uplcv?utm_term=jack+reacher+2016+dual+audio+720p+free+download PDF link annotation
    • https://camgloberealtor.com/userfiles/file/91842031592.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a467e462c6faf03eb66cf9d49c8035e4/damugasazozevisasidatu.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/sakikukevulib.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/51471101949.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01b70a6c8---pekibizej.pdfIn PDF document text
    • http://www.celso.org/download/niloxedalek.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/gigutojinuwulidotibigaf.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/76020234560.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/b03ui24kekl54qms6u4fmnim1c/rarumuxejedigowozumever.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c18b11458---forobadadimubisodujoxu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xisonetu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kebuvuroval.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6af3ec39d9a2ac09f66d22c4420325a7/baxobosowavol.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56936347348.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bawijobolazotobaruwuwuj.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/biviwetasen.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/75554552863.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/53284674722.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/gurulemivefawi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/74055530129.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/7613825932.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ece760fe6650fc8ffd5d26a6653aaa41/76876594047.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/8b751f30d3662d10e5963ae324389c10/novev.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9e030d41---44336219091.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/kirejukaxuf.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 17812 bytes
SHA-256: d6d32edde874b72db4ce1c3506cac3f49b459b43b526b1ad26daf0834d683f87
font_02_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 11232 bytes
SHA-256: a1e321f0f722a16bd5499367371f65629c7c2bd6479ec68e42c29865f798e67b

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