Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1faeb4340c83495…

MALICIOUS

PDF

96.6 KB Created: 2021-07-22 04:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8cdee564848fbcb03831151678008445 SHA-1: c1372e004e6ec7cf717f5c2528f4289033902f14 SHA-256: e1faeb4340c83495a46fa6e2bb98fc13911ac75959865f282f081e72acdb2939
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malware or phishing content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebcb5dd64---92891808570.pdf In PDF document text
    • http://orderbestwings.com/uploads/files/siwukugot.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98c762fa8---sasiperufibag.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3179e2815---witomomuwis.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b0546eb23b3fff033da9348c8d99d184/vopirowesupudixafidow.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/rugiposuf.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/lowoziwijetu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9612ed6ebb---dokogonugo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816e3696ca3---17689927142.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a3decd236bf83aafe6ba6428e69bda1c/12919228625.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/bbda5c45686b91026b3c4350a8c9b3c8/xabalowalad.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/30988460625.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/68794068111.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/23571545068.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dbede5777ffc6827c0b0692e9af8473a/34968602851.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/48710963938.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eafc5e08bf---39555480292.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a847998e31a---rararakalojemorumedu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c8c465af5---naburojinusovuseb.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf43b2d973---39048419169.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/manixejoxub.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1342ee734c---fupuladuvofixuxibe.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/27236057723.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/26993100915.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kop4qdjt9okkp3qtc3bec7v3pi/7416361754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ridley+state+park+trailsPDF 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_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 10412 bytes
SHA-256: a98978a8ae09f582896c8a9138647dbfa61390ecaa34a331d305933c2251635e
font_01_sfnt_off000130b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 17116 bytes
SHA-256: de11950e3c3fc89a652cfb1c54c026992a496be6cdf805f7718a779bf1f39f29
font_02_sfnt_off00015d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1