Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c517d7538ddc5f9…

MALICIOUS

PDF

96.6 KB Created: 2021-09-16 12:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6493db57d14b0fe4d6905336f8e92ba SHA-1: 174f974342972bca8e9a0057bd3800e75fb6be0c SHA-256: 5c517d7538ddc5f99323252fbacb06f09e79c3cfb642707009956cd72c91c612
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or scam campaigns. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=rom+original+tv+box+mxq+4k PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec6ad65f16a54eca7b9ce49d2ab48f36/30660234493.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/natogup.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/fajewimu.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/358071186.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/69128628281.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/99511301379.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/89630950421.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/loxabawatolefofemo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4f1372cc---52595054173.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/dajelulawakubabasasor.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a945e20e58---95525633807.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210916_CBA35BFC31C34C48.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/dinumuwitozusiz.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/92334517309.pdfIn PDF document text
    • http://builderall.info/userfiles/file/rofokunomopaku.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/momewubozes.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/patifeg.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/25161894561.pdfIn PDF document text
    • https://yodobashi-church.com/fifawovisop.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/ponolepirupew.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sdja26i2d7glhonm05jgkujjn2/46351141499.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/38767037065.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/mosusasos.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vonanusa.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/60449030206.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/36200320076.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_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 10820 bytes
SHA-256: 03c1af6bc8698aa03117d7d488a14d9f6ba3ccef2d00d013fd8f01edda42189f
font_02_sfnt_off00013faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 20044 bytes
SHA-256: 375630836524e6ddd58e806f13e120d2b41ecfb33329a5b4cfc25bc74eb55f95

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