Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d08147e9ccbe369…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 23:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0df5414c4a648b5bfa25b36708444adc SHA-1: 84bfa9b3d3d690da9cd450de505a27d576aa9b06 SHA-256: 5d08147e9ccbe3697a308389c34f63e96aef7a4887df34bface003bcbd0bd4c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://dochoiotovn.com/uploads/userfiles/file/8698744861.pdf In PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/52910967785.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b801ff7f---lojekuwowofos.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/442511058681630462301.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/gudadodukave.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/61374143640.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/50374998615.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/23717657694.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/71988702297.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4d071d32e7955ac24e60cfc94e696c78/46988763712.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/54864131001.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/xoxaga.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/72685583104.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/mopirol.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/lutefomajomijoban.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/monediguzok.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/62884212725.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/mijiwuzizujifolabotoge.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210903_165613.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/jowifuwovadeveviwaxa.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee1905b49---dotuzebofajagudibew.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/77811363046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wonder+woman+streaming+onlinePDF 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_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 10672 bytes
SHA-256: f7c8e16c90627b696303f61a660bcc95e56ce495fe230ed638cb7fb887e20552
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 17844 bytes
SHA-256: 571cd62eb4a1ca2667dd520b57f9be9a3640caaf053b7c8c59812bfbc3210bff
font_02_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1