Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7a594d00e6d02f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 23:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c7c8ff4525d3955e6a290faf6013c30 SHA-1: d66d8880d28e02652022e4a67c11b7a6b0a746d1 SHA-256: ad7a594d00e6d02f713e9202f09f06e1dbcf2a45461be7dfda284e375c0397c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also includes numerous external URIs, many of which point to potentially compromised or disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://folientastaturen.pl/_data/file/wuzogepojimaxub.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/61182663140.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/mitadakexekik.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/66119814328.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/jaforijupurudukejew.pdfIn PDF document text
    • http://teifsepahan.com/files/file/genareguzizodesiw.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/mezojemeva.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sedaburodakiliwulodal.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/fixisuwitusutivibe.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/dadotevozevezovuzogoxe.pdfIn PDF document text
    • https://atavio.ru/files/file/1725176346.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazobafofoneviv.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/88489213173.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/43516057940.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613db27febaa7---8192894665.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f43d284b2---69360916215.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vexugidaravunufom.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/zujokakibog.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/53146862919.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/75447225082.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/85061608135.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496d19ac1---kesulusebosovi.pdfIn PDF document text
    • http://halaljones.com/uploads/files/84379177893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=past+progressive+worksheet+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_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 10872 bytes
SHA-256: 8a177df7397ef16a65c23909025fe4d7afd333b116596b04ae2499cf7ff8f05d
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 18032 bytes
SHA-256: eec6d63d4e4fd284df1358f36e221a7be55c0e3e1d827e1c6a07513390d30529

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