Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c06cd90e184cce7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 13:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dea203e67ca5cecc201bfe55617ae4ae SHA-1: fd919fa7cccbc48a9b7e62922ec519517275a4fb SHA-256: 0c06cd90e184cce747e8245df66207efa0a75afb5d624059a5a4d8eb81e5ecbc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=amazing+spider+man+1+apk PDF link annotation
    • http://lezeckastenakosice.sk/upload/files/kojupadedafelusetozat.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/87324607662.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613728a05b243---54141243094.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136bef362917---76100590575.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/74667034754.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/bebufajipot.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/95798008482.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/gijuvarulu.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210908_E10BC6140DC73A28.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/xepasovolosorixumadije.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/wenedaroxofeneti.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/sawapoxanitixip.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/16116464885.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/917144960.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/78718184335.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tefivinepalilup.pdfIn PDF document text
    • http://njxinbell.com/upload/files/35125910668.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/10547096944.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409827a7d0b---teguzibipevuzunazof.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/88251358290.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8f96a948---76649900591.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/julepakogalunexasoxiko.pdfIn PDF document text
    • 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_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 20888 bytes
SHA-256: f68dc4b3632414992c660da60238b5374a0d86ea43d7f6f97766ce4d2243c794
font_02_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 10656 bytes
SHA-256: 691e1c8370c78875faa9c6a1d69a8b964ae9f19397a68c8408b94cfd35f74e2d