Malicious PDF — malware analysis report

Static analysis result for SHA-256 17934a0e5553969e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 01:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de85e196efe9d88a378789b05a2a93d8 SHA-1: 08c2bd8541ed3e34a6daab519448648185939cbe SHA-256: 17934a0e5553969e261711a049fcb43d7cf4b550439f92cefbc61adce49e0755
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0fcd583c6c0fdfdfe8fbb10437a1d8c9/39928967245.pdf In PDF document text
    • http://location-venise.com/italie_documents/files/82756790060.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/surijix.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/mevabibebevijoxovivedunu.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50166877274.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/22850686145.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/gadalujamogulef.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/zozineviwizileranaxuluti.pdfIn PDF document text
    • http://3sdent.com/upload/files/21143728471.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/zomuvewupavuvefifax.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/53207836564.pdfIn PDF document text
    • http://askort.pl/Upload/file/lekikinupoga.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f192ca480---zudubuzakopep.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/kanibijizinenipiso.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lnn7so60iu7squnkijjcsvtqat/43551550526.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/wirelenoxos.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210908_091830.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/68583439685.pdfIn PDF document text
    • https://mimpidia.com/contents/files/tofuxebuj.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35329597159.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_084411.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zapamegixumimerefunosa.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/32682938077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tubidy+mp4+music+video+downloadPDF 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 11024 bytes
SHA-256: ca16c16802ac798309bf468a43cef62f4e332baedde3eb947cca65055a6acb60
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 21952 bytes
SHA-256: a6ac71cee01a1bf533bc959d465553cccebec608d8b7c3fd221446b49bbfa031

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