Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2588156c56ca1d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 21:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 552a517952a9355d36db763d979ea860 SHA-1: b61c3da98231fa6986cd7b1001874a95685be6e8 SHA-256: db2588156c56ca1d4f1a03d52c253b02929cb2c18500b6ea6c91da38fbb86ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these link farms and the overall structure are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d196c2183f9de5d0abea69bb76506f4d/59369165144.pdf In PDF document text
    • https://zivotzaokny.eu/res/file/zekesalikako.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4c335ec113520e03b9ab252673ff8137/27932729312.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/vebufosudevalaf.pdfIn PDF document text
    • https://arerp.kr/data/file///60279050627.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210523163144.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b401c9b4---34216564457.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c243fc3955ce253e66c58168ed88522e/nugituzaxitabukugigelifu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/89231144859.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060513143539.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee9228861---18844121524.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/vojijipixeza.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/vivulibedo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160786bf9ba38b---jurojevufuzogatijuxo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tvo0ei9b9md5vgu7akeg5bmh07/totaroku.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8t69no4ssc2eep6lhf3hn5kat3/gimepedanexudu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c2ad5cd60---pojinuzurisukivunisasuz.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/35187733467.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3682ed0dedce61b9bef8c67b76355ba6/depukisoti.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091578b81e19---6560069489.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/17820192121.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/73469126919.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/salasuloxibotelorijoxade.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f57a1f24---78824164661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+a+two+point+perspective+drawingPDF 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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 17220 bytes
SHA-256: 6c49c4c616f60d1952a03b7c7ba360d5a7f86b752c2e861c99c4d41a20e99165
font_01_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 11044 bytes
SHA-256: cd56cb60cbf7de575a722a5690f66c4d0e9f39a0aa64284a7f1cbb97f03cdf34
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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