Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8f16a806e8ef4d…

MALICIOUS

PDF

97.1 KB Created: 2021-07-25 18:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfd626d3bfaa1d613ddd1ab35f7b040a SHA-1: 23a3a84243e53beffaf47f84244443a813097a9a SHA-256: ec8f16a806e8ef4d562780349eb98bc5354eefcde2b35fa894ede7fbc8a22caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. ClamAV and ML classifiers identified the file as malicious, specifically flagging it as a phishing trojan. The presence of link farms on potentially compromised infrastructure suggests an attempt to manipulate search engine results or distribute malicious content through seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ga8kdpccvp3gbe4c6k760amcu2/62839819674.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/zuputesesumoriwemef.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e6o8800n9rmb8e66jv7cib7ecn/jirexodezunin.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/kojatevugoxakid.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/67785afe3e8ff115c3e08a34e6aea722/nenerexuzuzedi.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/71345245786.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4orlhpil8s2sbhluhbjbmnigs0/16928165498.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/da1909e641de12b1b67c1d23ddf16e80/katebilonazapukulufoge.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a76be3c7ea5---12981072285.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a9696efb---daxuvesagiv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083104cddf8d---91551992273.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b218276a609---kagimuxiborowojeleta.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/rudataxuf.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9f3521e33d10e5cf7850e2a7cb157b16/wubamatasomorolu.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/8210068656.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e2f4fa1bd5664a46692cb81b2dde028b/modajekolekab.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160788b60c34bf---kosekizipubitanaxuwabobi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dcdf1d317---dowotijudixuzozo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ddb0de9e---66730034045.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fowafumanominolupolinogo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/21523017639.pdfIn PDF document text
    • https://medtek.vn/storage/file/wimufok.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/91284925400.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/21072217544334748467u99ax0d3gr.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+connect+epson+printer+to+wifi+using+wpsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 10624 bytes
SHA-256: 1f695fa5d2e0c421e2c8c694fd20b46164d9af86674d87f5c8fcafe3dd4bf04e
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 16200 bytes
SHA-256: a38a18dc5f3a25f14f2cea01a6df0f42c3b9562f9b3a112d2bf2dd2bdb944094
font_03_sfnt_off000147b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B7 17208 bytes
SHA-256: f8bf891579bcbb2738d764e27287cc6ce46029b419ff262b813afdacaa98a2e3

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