Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a082698ef6951ce…

MALICIOUS

PDF

83.6 KB Created: 2021-07-01 21:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6be11d0655bb8ae047da952e7689e4e3 SHA-1: b668bbe427d7cd19f6a411b5508eb7e80dd0f19b SHA-256: 8a082698ef6951ce28b4f43a6191d02aa2768c953fc1ab04a4120910695a99ed
156 Risk Score

Malware Insights

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

The PDF 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 installations. The primary purpose seems to be directing users to potentially malicious or phishing content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://detectiveoffice.net/userfiles/file/miranifavobovuz.pdf
    • http://savvyais.com/userfiles/file/54254311588.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c340d825---12818224593.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ab68829ab1dc771d91fcca33723bb8d4/80959529221.pdf
    • http://say-international.eu/userfiles/file/jiputozujuwikiperu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/555273a5aa9e0265d567f11bc551d60d/folosaratuni.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/43106181653.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/28090399515.pdf
    • http://konemara.hu/userfiles/file/sagawopo.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bc579f40---22443720218.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/22d43aaca1fc951fd2bb2b879367ff2d/ximotupifom.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160963567afde5---zididibizaxi.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7d3c7788---xofifajupok.pdf
    • http://fiumevivo.it/userfiles/files/67823643897.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/uokohdq3pdt0aneork4i1bd0qb/jemumevubukuju.pdf
    • http://belst.by/upload/file/82939560988.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3880691fbb---983037768.pdf
    • https://mebelihome.ru/upload_picture/kuzabumafobabosolovumog.pdf
    • http://gianniarnaudo.com/userfiles/files/90573758640.pdf
    • http://ndt-tl.ru/upload/file/10225908090.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/955bbf96e6f7595904f25adaf079257c/dekapovimapegipibu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b9be9510---89037665943.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/87339596527.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+minecraft+stick
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54b.bin
779b3bf2f5fc3b20af3812a28d8ebfd9c18d6a2f61d58a24d39ca6bb314788cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 16720 bytes
font_01_sfnt_off000110c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
font_02_sfnt_off000128e0.bin
7fc549337eddcba16b60b586bea5f6de5d77b28798de603582296a2ec6487e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 10620 bytes