Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4adb012c2429a3b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0dc4159b68cfcb16ef44b0b6d85b8dda SHA-1: 34c4097e5d34aa722a5180a11c7e5aaa206ef3e4 SHA-256: f4adb012c2429a3bbd72ef3af58030503cd426a207838a78733877bb59ea6ec4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised or disposable hosting, and a machine learning classifier identified it as malicious. The ClamAV detection confirms its malicious nature, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://etyekilovarda.hu/userfiles/file/59238650674.pdf In PDF document text
    • https://dongciao.com/uploads/files/202109031646491194.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/44558762290.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/zodinurulaf.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/36134009884.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1c560cb5e8635955f1d34e54a54376dc/56187134917.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/walug.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/53651105846.pdfIn PDF document text
    • https://bselink.com/userfiles/file/71566439205.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e7836f2d---ribirowebuzonesobij.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/46060847753.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e36edf763aa924c219bc8d4b4952b576/zoliduzarowubofidomiteje.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cc6b496ea270d9c7fad1566d09a89b6/gotadozunafuxufoxuki.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be34c8cb6e---81314730822.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/56115820362.pdfIn PDF document text
    • http://shesob.com/file/files/58172201661.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160807d07c3e83---zinalopepor.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/gupedagiwajurum.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a75f90025f291c0a621c7721f9656954/1018953589.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/75829917831.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/pewabomawebuwo.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/38070314773.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/moxumijobedinozagenem.pdfIn PDF document text
    • http://didula.com/img/file/voferijezatadinemajonu.pdfIn PDF document text
    • http://slsnn.ru/content/file/fetofafiruxibun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=archer+c20+user+manualPDF 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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10508 bytes
SHA-256: 53d8c85dbbeb745a4b58015fc00960245aa89960271dec0b0b18c207601da9c4
font_02_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 17888 bytes
SHA-256: 13bba9399c58bae217c3009aff879c305cc48e2b0bc0e2597a852b93fde707f1