Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa4de5399707807…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 22:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 098ce384908fe046609cfc5cb1f411b9 SHA-1: 3fd3343f7d9590c56c7064a842577691800cdb55 SHA-256: eaa4de53997078076574516e99b0445a7c7b61851e56d2435ad33950b8181906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The document body is largely unreadable, suggesting it's primarily a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn--dlek-5qa.com/admin/UserFiles/file/23533843803.pdf In PDF document text
    • http://bischofs-scheune.de/userfiles/file/bezinosefotatosoxotogu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/65193083397.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/durodafipefifiwatobur.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/53649357351.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161411efe12058---goxadodi.pdfIn PDF document text
    • https://proxus.nl/file/39621154732.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/balelubemonuvu.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/42490888246.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/sasupupom.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/99264063487.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/virowugemopanoduvevav.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ulq6s0mgpge7d3lchlvncop360/5701909136.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/kamotaneleripadijumuwu.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/lifopamasezitemexera.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/77419477822.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xovupekusa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5a390960---dugupufasipuvatefapowubig.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/wojatulowatexomaleveg.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b7c4693f---nisokosonuzazi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/99617826639.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5da541f15c8681f9d253ed04a92d9227/35883317972.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/zujubigipi.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/37954931830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=paradise+lost+book+1+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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 18020 bytes
SHA-256: 1df53a064bf5552439faa76617639942790722ac6166ac991ad61d94e563e17d
font_01_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10672 bytes
SHA-256: c1f2f1146d3264c4c56a8fe0802ea4f55fd27a6fa21445191c3f626beffcd993
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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