Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c72cd3f6536cd9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 03:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9309558e1027876d0086bf827b7ae4fc SHA-1: 36850fd9bc31d2815a127eb6b08789fbac06a43b SHA-256: 82c72cd3f6536cd919b15d9f65ecc0165b5a99b5dcd7bf39527cde6046383e3d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised websites, a technique often used for SEO poisoning to lure users with search terms like 'download frp bypass apk for android 7.0'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or facilitate phishing. No scripts were extracted, but the document structure and URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.moyekolodin.com/files/88654608523.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002999a34f---lazokawidirakutafebur.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/40786472791.pdfIn PDF document text
    • http://techbis.pl/files/file/xepilezove.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/forunevupevakupirexefexe.pdfIn PDF document text
    • https://thepainter.asia/upload/files/towexemanazozi.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/dibudaz.pdfIn PDF document text
    • https://eetravel.net/file/judimunidowunekima.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/dipawirero.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/12261970507.pdfIn PDF document text
    • http://jarosi.hu/files/file/zosabaranekodupig.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/mekubug.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a03faa97b7cc3b2fb8c4746c78886906/dazud.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7frtqhp4c4scbu4tohfl1ea7ng/xedarexojadiwetiva.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/zakenusijobiwugogar.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/90658311249.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/xotimogutokamoga.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pejubavivi.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/xuximeveso.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/18035859107.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/28130862542.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/bufarixetewedisujek.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/gorujetuzixepomob.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133a424873---zuwugikaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+frp+bypass+apk+for+android+7.0PDF 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_off0000b08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 10932 bytes
SHA-256: ca9a7d27f102400967036890c84252400c71f07fe38b0eba5736132fe1e4cd7d
font_01_sfnt_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 16908 bytes
SHA-256: afaa23db72141d12b2d60d39f960c11c36720e9d05ca01c304a77cb860302bda
font_02_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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