Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c416682da0da8f3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 12:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90e8c4ca276f2e5c92b26558832b99e5 SHA-1: 343d62037dbac7631254f6dbf674effc5a40a146 SHA-256: 8c416682da0da8f3bd0b43a0f082ca47e330f0e50002e5b1992376979d80f1ae
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting. Heuristics indicate a high likelihood of malicious intent, with ML classifiers and ClamAV flagging it as a phishing or trojan threat. The document body is heavily obfuscated, but the presence of multiple external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://gdgom.com/upload/file/210902190954511696hj25tkbp8gsg.pdf In PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/8446813441.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/56219366792.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/92655182534.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/35362834488.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/mewaguke.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/55916932899.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161318d036321b---xegawezinaganogozokafoze.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/42d6c444759d1d9d789bed1bd00c847c/73568375060.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nuwetafubura.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gajewokoxufi.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/84210450244.pdfIn PDF document text
    • http://leguido.net/files/tuxexotetudoparagaxuteno.pdfIn PDF document text
    • http://ndt-ultratech.com/files/48291133427.pdfIn PDF document text
    • http://jngf.cn/files/file/21794934245.pdfIn PDF document text
    • http://asja.ua/userfiles/file/18851087750.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/12746511035.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/81d287d2aaf03b60dd6b3298b2df7532/15890635355.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/noxapebem.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136d60f3bb12---nilewu.pdfIn PDF document text
    • https://olterus.org/contents/files/tufipuweruvevavatojigud.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wafudijaporokex.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/visixodipirafevedakor.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161302d1e05cfa---94059799227.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gm7ggp80v1ko96t35tsqk95tde/sajutozimuxiwubija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=slot+house+of+fun+collect+free+coinsPDF 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
stream_005_off0000ed14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED14 18132 bytes
SHA-256: ce28e1772f405b9cf07525d8ef18639cf1e81c514daf435df7e95d70c13c52d1
font_00_sfnt_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 10444 bytes
SHA-256: 0e7857130ba0b5879a55e3e5178520e86f051fd9ede857f3f624d26b41898a91
font_03_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 15420 bytes
SHA-256: b847ce3718198b509dc099dd40de53b4cdc5a8f0c8e5db3047aab1c03f9144f8

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