Malicious PDF — malware analysis report

Static analysis result for SHA-256 85198f6e06060bd1…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 16:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4a9e48cfc06c8b3dec5286b9650fc3a7 SHA-1: f6dd13bd778f80be76e8f4d0969558849cffc57c SHA-256: 85198f6e06060bd10bc2e3d8e9f5047748671bd7be0333f06d01b44dccdaeb63
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://steklo-shik.ru/userfiles/file/37121333404.pdf In PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vevekigarodaxivanuliso.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/49025960129.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/sudifaf.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0b9ce79eecde93f7bbaec260fc4a8ee3/xodirugamagopadutozafebit.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848a182d08e---519017745.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1bf9940e---9716017352.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cc96cab2cf758dc4aac22133a4726b91/16816059726.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078396705c6b---19284771659.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rlrgbpcg7hshftc4gvct5s1ec0/wunava.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/86492930584.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/xuvoxekesilisunosezazurez.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8ddc7cbb42be9ecca034d14bf2c17bd/biguve.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nb37d8smbt927uvc2q4ef2tdi5/73061156727.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ab44a221e540df41815fe6a3441e668c/desabefowoxuwefugukazutak.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/34352979090.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddbcc0316---komotiropelogasutaw.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d46de8de1f10542b1f1b1ae871bef51c/59470192555.pdfIn PDF document text
    • http://jkohut.pl/file/fafidonaje.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/rimiwapusa.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/badosadawezozozipuzi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e278ef56410---6269236943.pdfIn PDF document text
    • http://hangquangauto.com/files/60868157223.pdfIn PDF document text
    • http://rubensova16.cz/files/file/88965887737.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/bufapepusukimupubi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f2534013b6b42316dd449900398dc552/lasexadax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gangrene+arm+picturesPDF 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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 16964 bytes
SHA-256: 3d3a1c89454e5b8de9fec9673e79d8c3ec20fc8192376a6afa42e2e3e4db7c2f
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 10688 bytes
SHA-256: 7de007313475fef346a9b29fdd1cf5ae5326260358f30fc7e72441e497524daa

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