Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6ff966db1841da…

MALICIOUS

PDF

110.9 KB Created: 2021-07-25 20:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c77b95a8e6835d9eee0ad04ce6c527d0 SHA-1: 9cd5e6226e7e4844c66eb2e9b8280593c9955c6f SHA-256: fd6ff966db1841dae4a8feb0552f69fd802d400091b6c5041cdac115cb4162fb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d88534f6f---5370657651.pdf In PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gq3gug8jakjkhcm7nnlu71m2e1/5736673500.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b49b716b9---luzenebijitudug.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e0e8ba7c60b700991ae915c202365965/60577938772.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/15547852620.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21d8d368b---tixupagulisuromup.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aada57210---rutexadifikonifaralomul.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3bc162cej7d8bmiiiv0hcks2fd/kavepe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a700b679579---17733737663.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/mevibudegiwuj.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/jobomelelegitawuvoba.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdc35624f02f481489ea75d06080fdd3/40785669336.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a17e974f---ladarukununowo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/55932313957.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55c7ece5d---91775947612.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/xamosufifesofoxe.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebba0e93a31b67e3a221cbc87d1c7110/renewuwawusomosaf.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sikupanulowitenuw.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a844d688a5---49568876471.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/nonizobuzepavanim.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/buwel.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/da9b3666eb6902b5fa14043964deb581/26832440858.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c219a525---17346606686.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/6c10ec2d65801ea8d0350a6056e4ffdd/vulafijuzukeweboxixa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96aab37c4---witudedegokuzedenawu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cc268d1b2572b4339fbe6d4df23a02fc/pofawuxusugexibulidavedev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=is+there+secure+folder+in+samsung+a20sPDF 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_off00013bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C9 11216 bytes
SHA-256: 2dd35b9003cfcfa36759ac2f340b140aef4ce203c10ba37cf75c945e33e46866
font_02_sfnt_off00016da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA8 3544 bytes
SHA-256: 6693fd35bf7f3736950a41a7aee60037068f75a281dd5fcf5345bc2269a7f99c
font_03_sfnt_off00017bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEA 18804 bytes
SHA-256: c7791ede23e54ea47199c08ba870e850c33831460f78d35e57a1495ed993a36d

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