Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c04a4d2ab6bc23…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 02:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07fafe4f23fa882af1290610e5553725 SHA-1: 9f77ac1648a287044d31094c5fe40e5a48004713 SHA-256: 16c04a4d2ab6bc23c68be60fc94b1ee70de5f6bb918e818711807aa40fb9c9f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests it is designed to redirect users to phishing or malware-hosting sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://coretry.ru/uplcv?utm_term=watch+the+hitman%27s+bodyguard+online PDF link annotation
    • http://chinalabware.es/d/files/45044705645.pdfIn PDF document text
    • http://unibox.lv/files/text/46540023749.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/15203340830.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aa53b6f946c3b615f3c8f437def38504/gogag.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_180051.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wapoli.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/lufezerewezitifopesileki.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/verowuxigobipojinapez.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tabojusoduranenokab.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/93329780738.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/dolenalirorak.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/gupawatobu.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/genekefuwabi.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/93172205022.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/48520136065.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/regogowunepufiji.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/82754389028.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd048b5df---45042693103.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fd83b4939---kurubirofa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614331690b0f0---9647544309.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b5ab0e31b---satawefuvelefuxiwis.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/puzuluxopud.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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 11196 bytes
SHA-256: 2c9b7d4988e456e7b5d8d54cedb4bf197d1702597bd253da1f8f9a4cfa33180a
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 17844 bytes
SHA-256: 8d843fec10aab4c2b5e3d192bb8ca0f62ac190fa141887253a12020297157e29
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.