Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6961d71b22e1432…

MALICIOUS

PDF

90.1 KB Created: 2021-08-17 17:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41a49d7315dc2e76787e2bd55c5a46a0 SHA-1: 61d275778dedca6d403e59c71bede5f55554d241 SHA-256: c6961d71b22e143237ca496256f16a6978ecad2ef3f8947c8ef36e764d758304
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to distribute further malicious content or phish for credentials. While no scripts were explicitly extracted, the nature of the link farm and the ML/ClamAV detections suggest a malicious workflow designed to lure users into downloading or visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16075021349d8a---31418032039.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8d5b51087547c09333e8553106e6a79a/89209099936.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c89d13e1---wofuxafu.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/25340308168.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084063472532---xeruwapegipuwelulaliwul.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/tasusa.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/fufovigaturomakilig.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610353fb8726c---nalinamigigumu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/2324739009.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/minezokajizezubovuxudado.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zarolubuzekivutiwenu.pdfIn PDF document text
    • http://chayka-svg.ru/files/vinokodu.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/57065684359.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0f9c01f778daa4ca8ef10f60f9ef7651/83656183583.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/76572974295.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/78045906370.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/62968167987.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zudorolujovuxizodogo.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/jomola.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae95d46b8d---xijupiganawanevoz.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gogafeguwedomiluka.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e27b5dde---teroserarirupofar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dls+18+hack+profile+dat+file+free+download+profile.datPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 18044 bytes
SHA-256: c33942faca79f4f650726fe8eef4f167422382641eec5f4040c6ed29518be20b
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 18096 bytes
SHA-256: e6bd1e9fa14ccc15ff7824fa67ca020d7e8b648fcd64e90dc350c7deda95eada
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14018 11224 bytes
SHA-256: ee650d397bb023cdeaf577c9ba3e94943536fbb9522b41f7594d49c17b187f07

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