Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68ee6d40264d511…

MALICIOUS

PDF

99.6 KB Created: 2021-07-20 14:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d95abc87f7aef5267ad4f3e99cbd6deb SHA-1: 06018b8f92de3d78123bea9aadb6bd13b8acce49 SHA-256: a68ee6d40264d5117c0bd7e77562c5ff71bbf6fec14c7c9d0435bd29cbb86999
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of disposable hosting reinforce the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5db8a5d1a59e991af4b1213da82f5855/58446795796.pdf In PDF document text
    • https://agentcctv.com/userfiles/file/supofasijuvel.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zobotonemevokowiturijo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8777f250dc6a2b17cb2f4b4cb6dc8545/regiso.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/darekevi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ta8j2sh6h6st6en8f25uh0o62q/wixefosuz.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512015121916.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/32068523694.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/60030821681.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160867a2e9c4cf---xulerofoju.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3d6065bc49286070ffb7804abea1a029/56229052800.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00510c107---xarixomalerefuziruxorudor.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mlkml90ppmskr4o910t8qp80va/65993115316.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7a9d52116eac99ee8ed75ae1a3167930/xidapifufetuzonu.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/92797286473.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0052720f318afb5eb6da6533feade56d/85942429316.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/gabivuzuxajopofivis.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d5e32a12---92706273031.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/80439288507.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qp2pffj06erb8kqoiivvm438b4/sonamuwugizeduposo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de9021ad8f8---dikififabumikoxog.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/83046223221.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/73591376253.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dbb9112e---namepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mianhae+oppa+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 10280 bytes
SHA-256: a7b321e1af952b6830a100484fd2060d34ccdd64377acff245eae51313661dac
font_01_sfnt_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 1684 bytes
SHA-256: c56fbd6d0a15460ea55dfe27c5e16aa70a384f3bcaa853738180b782e2485878
font_03_sfnt_off00014eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB2 18584 bytes
SHA-256: 2d2bbadfe434425020fdeb5a1451527ffeac683242bb02858820c9ce5988142c

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