Malicious PDF — malware analysis report

Static analysis result for SHA-256 528fb30d46af7c49…

MALICIOUS

PDF

85.9 KB Created: 2021-08-11 06:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0244bcd3f7a08e61ecb227eb72bb84b SHA-1: 57180a3a33c485fe4346ec7077582f9b68de69a9 SHA-256: 528fb30d46af7c4927e2b5a515474f1b164b972a379a4c72f52cfd9a83d3d2cf
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various websites, some of which appear to be compromised WordPress uploads. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://huntic.ru/uplcv?utm_term=al+quran+30+juz+download+free PDF link annotation
    • http://natproperty.com/userfiles/files/gubex.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/sosigexamejexewupotumag.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/69474030976.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/75577000197.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/55627964320.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/37922309417.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1dc86875b62c9a98cb368a1dfda6e1a9/larawujisusonawuvukasax.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f0ee945e---rariraluvajebeturo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mmcoqet1ghrqv45is9t1m0q6j6/83785744227.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/zivutukudenekivebibif.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/dawozakilexifu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2c6700472b46aa959847acd290c337d9/fowakebovetis.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/35433133764.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/tonimufid.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/1034773585.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b89c94b46---46714160611.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dkv023672jbre4b4ncb7imlk60/wusamukudogixopetekip.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b48317c73a35078005a46dd00078b6b1/guxixijatizedum.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/01c975b0fc195269d826c722539c045b/xugolezifapurakawabakujo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/2819395413.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/10438243128.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160de8d347e6dc---zetixububoka.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_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 10788 bytes
SHA-256: 7a3eb6e2e0c0a93348dc501c253508857d5832899cf63375d752a189790e51ba
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 17620 bytes
SHA-256: bd41ff2644c8ed23ab125c43b923af7cee40ebfc69f4fbb2c17948a620eaa2d4
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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