Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd259dbb44e32d9…

MALICIOUS

PDF

92.7 KB Created: 2021-07-21 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6dd5141e6d3f380064b0ba6218ff5d48 SHA-1: 4486353deb0e78eb2c3318d584fc263832e10ad2 SHA-256: 8cd259dbb44e32d959f022ad6c37e7b4446f97e34ed33dade935afb0b23e19c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607848df055e1---netorovufob.pdf In PDF document text
    • http://cocoal.com/uploads/file/powavisezufidojegavu.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/91482503524.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e3e1d7c764e515e801caa1206a86f922/87696606744.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/jukudososurabesezowutom.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/jifijo.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/xepupoxabivopiliwabirog.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/rewuliwolaxalelex.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/dixunukofobakegijofez.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3bae84a162f005a3f0729c4386e7fc1f/86581728292.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/32a26278444528898ab0a0a3119d65a1/soxubi.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/woluxawo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ona9vkl160rtv5gkf35lh1hb40/rebokanofuwubuwujekejan.pdfIn PDF document text
    • https://mfdesign.hu/files/file/negibetugu.pdfIn PDF document text
    • http://planbmedia.hu/files/dowejasuxewadatep.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l08r2qk379jhkvh0v03qrdlgli/37037387086.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/meguxererawapusop.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/monifugupekuziruneb.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ed86c05c---gifibisigajiwi.pdfIn PDF document text
    • http://zzweien.com/d/files/dulug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d430ce2d28---mopor.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hki7rrf3rq8rakbbr4uq7tkitm/nedolaxerimuxi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/jugetixomivifipogobenedib.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/vipafosiwezegiwulanaduxil.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/90817044890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=net+core+interview+questions+and+answers+pdfPDF 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_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10940 bytes
SHA-256: 86b1e6286f6c4a005dcbbc4d2c3b54c373a2f24d7f171065a7d5791f69d84c01
font_01_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 17420 bytes
SHA-256: a1a00b3be9c9e85c62ba80efc082c99c12bad1254d9b04171dfa81b3d63a62c9

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