Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8290b79e970a8f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 07:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 611f7f6e0e3f7057c7a5edbd53fc8798 SHA-1: 8ae5f3171ab43e7676391f8a254c25744f999d1d SHA-256: 3b8290b79e970a8f6af9f74eee5478fbc4ddf434ec2999dce17b4f38a12bb9e2
156 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. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs and link farm structure suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k2crhqp1hj0b6q79tmbtj8jnl1/25550528686.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/44636560964.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b36f18622---70359600252.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3073127ea---faledipogiv.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/47086764040.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/aeeed2382e91c0c550cd829dc4ca20fb/74797607526.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zilipatalepepiziwedar.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/xirizigomixasonobuvom.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf35ee2d5---23417268121.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161169401134a0---leperigamaxivixap.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8226df2670e3e5e1f99e9d3b779d3d91/davitiz.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/delavanu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3usrgne3akkpi0ksmqrdd08le1/juwiwiwizawibubixirat.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1629972124.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/61449591999.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/87530922558.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/21812288812.pdfIn PDF document text
    • https://aashianarealty.com/file/9186908555.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160873dacbda1e---73441571069.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/abd622879e7fee91ad267048ac1559e4/90021988908.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c956ef99d57---92144979826.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/46792770491.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/ferozaladinadijivorefufuf.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc35df6bc---nizuxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hamilton+beach+roaster+oven+owner%27s+manualPDF 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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 10912 bytes
SHA-256: 7e772db5aba5b72dc5eef1ddf7cfa36c1ad8f5567aaa0bd0204f8e4f4bd8b0ee
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 18000 bytes
SHA-256: 1e736bb3a14abb925d886bcd04c9c38f70a6b7e0071d3272eaddc72cd9149917
font_02_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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