Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5a08447db9c2df…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 21:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad124d43cfbeff0f991feeefc1d1e52e SHA-1: c2ee3f14e59f8c911aaaead6353fe52070737ed1 SHA-256: dd5a08447db9c2df38b85f2c80d61dab2486d41458e5b940a53f8b703a1cb518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on disposable domains or potentially compromised CMS upload directories, consistent with a link farm used for phishing or malware delivery. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sdv.sk/userfiles/articles/file/85004431721.pdf In PDF document text
    • http://agro-partner.com/Image/files/14721491000.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/gasejanaketedowapopevem.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8dd3084c707f6773d82a8db3f325a51b/33942506540.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/woxawiwixotu.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/rolipagedopitijipan.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/88090283145.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/sepekenu.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/wojukadome.pdfIn PDF document text
    • https://mcsfood.com/images/file/17412614470.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xezixokoxulabaselawo.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/40853487824.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d261835a5---51024758456.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/91044295253.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9ff19b152ed0ceaec38327b9dfa436ca/75070644560.pdfIn PDF document text
    • http://stonebreaker.at/67066829386.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/66693148086.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/59187474522.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/81985895107.pdfIn PDF document text
    • https://shunnasato.com/kezulisanimok.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/1274280805.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/givuzodazopewikimuxejejaj.pdfIn PDF document text
    • http://poiskvod.ru/images/file/78976448122.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352255da9ee---75615309917.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tebedaviradu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=concise+introduction+to+tonal+harmony+pdf+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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 11216 bytes
SHA-256: 992e09595a8e51f6741d05ef26eee9d059021bf3f000c6eaeb79b0a5f8f5bada
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 18488 bytes
SHA-256: b2308324317b89ac3976998c9f79930ade8f424521f4ac7a8577ec5ee920c3e1
font_02_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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