Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae09a78fa7aa18e8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 21:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3963177b9eb9603461e2d0cc3bb2d6f SHA-1: c5a554e763c4cc3f62c26fc9fae7a1d5178d6d12 SHA-256: ae09a78fa7aa18e8d22dce0ed1d59b63b0a69fb95ce737de60e886c35295d4fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.cafeinca.com/img/public/contenido/file/56582038187.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/13791345166.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/79568155845.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pufunexowaz.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/difewelanisokuvepifel.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/kuludaxusal.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/73112054098.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/15824309521.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/47008929959.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_B7386FA2CD7F972A.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/visezimez.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130793ae529e---79187860831.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56dca0cc1---xotutazepamaritaxevudomib.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/jewetazutuf.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/24570306482.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/86319388106.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/050241015414.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d158a5e168---jigemigunoga.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/51598121616.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/ruxawozedebemijeromuzise.pdfIn PDF document text
    • http://nincity.de/inline/file/6429916898.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/63808372388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=think+and+grow+rich+pdf+file+downloadPDF 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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 18856 bytes
SHA-256: a38cf0361d0af93012420e96bdbbb8b78fb96362d9560918416c4521aae9f2a1
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 10776 bytes
SHA-256: 8aa0c8b37f989fd87ca298905d2689eb89f2325d6b5867474e316ab2c9650f99
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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