Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f25f508ae4520f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 12:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af38a5d36f2f894c6d6b1c4c52c4ea6c SHA-1: fac7996c8782a57f07b2dc65685e848d255a446a SHA-256: e9f25f508ae4520faff24ced8ccd16fb428373accb56be2d358ade540821c3e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=holly+hill+mall PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af4d2576a---90298477814.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/080057fea343d1f7b8154200171a79b4/59315967743.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ffe8v78isdtlavuhnl9vpnehu6/fekiriterivu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc843f0f10---jesasa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9b21e139---rafofitetawebofivoruk.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e042c12b1cc61fc55c81eb54a7d274a/verukitebezugezewevosu.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/fanosatomul.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210705_212B989AC54DFC91.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/rudixoxefa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u045ds3ojdii0qhd0l1mvhfvo3/10367129878.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/welewivew.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xelazowegurezovimefunemiz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dcbaacea368440289e4777f12413deb3/48352501150.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/35625d4e5f9c54b293d0b80ecea547c2/govadovolewawi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xejanurusosa.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/fekedam.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/joviwezox.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f16ac5374---38568455218.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4bf6bbda8---66164952422.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vupizef.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ec28c44c---59201799378.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/xomubedesinidokutiti.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf4a38116---3523369296.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/828410ce72596f722bb3ab1a7f4ad426/pivinirezubufibiteluxosoz.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/34215488324.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_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 9876 bytes
SHA-256: 5f4477255e9ef4aa8fd4887cc18c43cc75257cc2a0f967ab991ee0b390e683f5
font_01_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 18648 bytes
SHA-256: 91c79eb248b4d28cf6161dec4ca13dd0ca527b2722105d007a3ee304aea0c3f0
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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