Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e16a9f292d9aa1…

MALICIOUS

PDF

88.3 KB Created: 2021-07-31 02:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2503ef408eb6735e6b1c02615097d17 SHA-1: ddabe02b02e3307713cf206eef01fd91fa72842a SHA-256: 62e16a9f292d9aa1b964f11124b9566f7d6980b3fc110e6b452a5b1e94787eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://infrive.ru/uplcv?utm_term=how+to+make+uppababy+vista+a+double PDF link annotation
    • http://doks-films.com/pcms/content/file/984634004.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/12122988274.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/riwupufijujegafopofe.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/4724484215.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/86150271977.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983808ee21a---bomuxugobos.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/41829153523.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/83987155356.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6363fce2---46179848019.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0ed72334---buraxojonid.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zaferikij.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089942d99a44---30165747897.pdfIn PDF document text
    • http://cke.hk/userfiles/76731776228.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/tofamepefominutegaw.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/66559651488.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb00fc34c9---wobupilowegezibalileri.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b9929f6d9---widifero.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb278f084---30499331012.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xivexutafapixipize.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/41450640596.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/58qhnc7qrk00j3pvukird2uvji/guvawifinukeduduvekur.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_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10936 bytes
SHA-256: a0a106cff332162afec858e82a5dc73cb89a292b902e03bbf96b4a9d8e3e657f
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 17572 bytes
SHA-256: 20d373059b9da2d061ebcf5860ce551daedfaa8ae675b14d41ad1e34645f31be

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