Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af72d47cce53b4c…

MALICIOUS

PDF

87.5 KB Created: 2021-08-04 03:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: beb16f0062244efd52d4593b379e8d59 SHA-1: efc6dd6da6b44a496b4a29780bb0713ee9732b2c SHA-256: 8af72d47cce53b4c50451b5973f9c4302e5961ddb73a2b770345e39501ad0537
236 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a fake CAPTCHA lure and a password-protected archive hint, suggesting it's designed to deceive users into executing further malicious actions. The presence of numerous links to compromised CMS uploads and disposable hosting further supports a phishing or credential harvesting scheme. While no scripts were directly extracted, the document's structure and heuristic firings strongly suggest it's part of a phishing campaign, likely using embedded links to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.cenlajobinator.com/siteuploads/editorimg/file/topewopexiri.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mnhbgqs196p3c6jhkmlhiin9oh/wadegebonipoxobibapim.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d749e796---14261343731.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ntl38mg4lobjbp5ml3r4ng9ip7/77171494070.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/9339914826.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/26433415890.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bf241558---rofifipufusavudobu.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/pifenetarutuseribuna.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160874fe9c3046---12246012350.pdf
    • https://nutricount.cz/UserFiles/File/relupeg.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1600b1113662286bb33f1108af721307/kupurixigalu.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/3fa8a80ad938d012790cc3236f4e8cf4/burisewimovikoxutosodidu.pdf
    • http://apricomm.com/userData/board/file/zovekes.pdf
    • http://microcement.ua/userfiles/file/vodidonezipevepudowuz.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/40d42d672b0afcc446930c31c00b8fe5/9475873627.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7kgssdg26iivaf1vc3atq9u3s5/79127740803.pdf
    • http://solarexperte.ch/fckeditor/editor/images/file/74515589172.pdf
    • http://guides2alpes.fr/uploads/file/sinufarobasojedenezawud.pdf
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/sujofijik.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b503d033fbeb369719321697d70338b3/boxonitofezoladekixekub.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/50d82d2b9898c33e4d3f6474828decec/mabazegawuwut.pdf
    • http://chieucoingason.vn/files/10109860046.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qqchr0odbf69v65dm08kbheno3/miwedopezobix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bellsouth.net+email+login
    • 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_off0000f151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
font_01_sfnt_off00010968.bin
84bf62b59ef71d46854af57dc50a383d97b2f0e7554d9bc233b7e19c06770da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10676 bytes
font_02_sfnt_off000121b4.bin
1d4835d4ceb7ffc4499f55b1e26e5074a4c905ea617862c9aa26b93597d97a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 17376 bytes

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