Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6cb59ce2c72b71…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4cceffee38c5842f52fd9c4cd95132b SHA-1: b2f30fd96df5629c2b26fb32075612f791bdf6dd SHA-256: 8f6cb59ce2c72b711be14423db64d3460fff0af2225927c7e9c4c9ba846938be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that would typically leverage embedded JavaScript to initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=civil+3d+2018+crack
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/10054267480.pdf
    • https://landi-bg.com/images/file/97310808411.pdf
    • https://myparrotfood.com/user_files/files/gidevoj.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a09021688---pimanotaluxivak.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/14893177649.pdf
    • https://cmf8.ir/data/file/roremavojomi.pdf
    • https://fong-cai.com/upload/files/dikit.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147e79a67b94---47217724937.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140906be903c---dugatibipamulopuno.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139087bc1f34---notalepubafudep.pdf
    • http://www.zywawiara.pl/pliki/94760435729.pdf
    • https://growyourmoney.in/userfiles/files/mepubas.pdf
    • http://appartementslisa.it/an3_Uploads/file/rabetalojedewimom.pdf
    • http://asremajazi.com/uploads/files/47887767241.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/tepovorifote.pdf
    • https://hoangvan.vn/wp-content/uploads/files/43841943024.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc32b8db4---90367208511.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/17687977011.pdf
    • http://seoulgreeter.com/userData/board/file/zifajagimodovabimuj.pdf
    • http://keacg.com/upload/files/mokipulavikafumenonixi.pdf
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/vexomabowidimodavirasag.pdf
    • http://hicoweld.com/shop/fck_file/file/luzegil.pdf
    • http://moto-bike.pl/userfiles/file/5782456050.pdf
    • http://babywagen24.de/userfiles/file/68505831319.pdf
    • https://bestofbucerias.com/upload/file/tovidijatogaxapagor.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jet35qca6ip2g26bbhtadfnjta/lenuguxarafexomimagitinu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 16792 bytes
font_01_sfnt_off0000e956.bin
155d0532937f3baab9dd51975058a7cd7c3b298fc8c6baaccfa08a9d18c8110d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 10604 bytes
font_02_sfnt_off000101cf.bin
54d96ee84d91e8ee9a490193cbb07f240f56a1405e1385ce3f80fe4d791fe4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 17792 bytes