Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6a0f59610ace93…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 11:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d5d2b73c8bbf19126685f3bb85a9482 SHA-1: 99a64ad9911148928371f9299a67a521894a183f SHA-256: 5a6a0f59610ace93c06d98112b4d6668657f448f9dcf0dc9e2228b84be8f9d71
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to PDFs hosted on potentially compromised CMS uploads, suggesting a link farm designed to lure users to malicious content or for SEO poisoning. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.gdchgs.com/admin/img/files/13663496546.pdf In PDF document text
    • http://ppfi-online.com/userfiles/file/wixenexawifa.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/sunowiremobokadi.pdfIn PDF document text
    • http://cmtsport.com/pliki/31342905125.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/2590544066.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac38231e1---gibimifovuz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a019a5ccad---96786917216.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/25613180007.pdfIn PDF document text
    • http://kingdom.vn/userfiles/file/movososefafofelosafu.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/kumuvivimavamigiz.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/zagolitawok.pdfIn PDF document text
    • http://yibetter.com/data/files/befobudi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cdc2712f2---51767390819.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/rowonupaledin.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/80003482961.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc512efe8f---88676309587.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/46288252973.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/33051607526.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/bugasasufazefo.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/zokukejujigofuvolip.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/5815564143.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/67522106007.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366fd6eae92.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/56758104455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gta+y+city+android+gamePDF 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_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 17180 bytes
SHA-256: 7211f2e46c4ef28300f300a5bca32bfa5026e1316007bfad3ee32155b5c810c5
font_01_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 10652 bytes
SHA-256: 1f167446832b32b7ab1f1c15c9341c276eac4466368ace9884fbbfca2483de0e

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