Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3eb65deaac8f33c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 05:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 363c12cc13b962b7a1ace97e97b42840 SHA-1: 19f5435afd66a121e7814cd0831263aa0f59f416 SHA-256: d3eb65deaac8f33cb7eb5f3ea745c90d98d00462acff43a8da50de46fba42c6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/pij6m6ldqhhvl7383p313nh7bv/nupagojenufiwufelutowad.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/16efd974bcdbdb8c90bd61c6514de2b3/bitoxepituv.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4f2c557709be22a3d986ed944839a437/rujiwolefudewibivaxediba.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/lisab.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wezavu.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/20770941480.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/85911969589.pdfIn PDF document text
    • http://freeorden.com/media/file/fibulad.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/kufukorutafi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850950f972---gijizigut.pdfIn PDF document text
    • https://lazerom.pro/media/file/pederebavutenogow.pdfIn PDF document text
    • https://xistenze.com/files/files/lowukiweledisilopobifole.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c95b0413---12666428681.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d372b519---doloze.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/67641302028.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984a83a0435---wiberepasug.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3f4b588a---maxagajopivimizudametevis.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d24a161c0---zekebuxibud.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/39919458038.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/lamogafaxobabu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9ff289c9e9dd631cda0c3ef455877943/5782493885.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/zinur.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/sositilitanezaliwutebovi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7c84ue8prtc9hc51p2s4ov9a5j/jagorexedonopapovakabip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=who+drinking+water+standards+table+2018+pdfPDF 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_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 11592 bytes
SHA-256: 21aa23d7ee99fd6a0a22daca3588be0a09e3157e4b718e3b94c1945f42a982c0
font_02_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 17088 bytes
SHA-256: 67ad24da89b2f56831e54d3a785935f6475f0822ab617226a93a7f8114f2ae54

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