Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aff6b3537cf173…

MALICIOUS

PDF

84.2 KB Created: 2021-07-16 20:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ba889e2778b927b803bf6e6d019c8407 SHA-1: 6fb9f251937e240a234486e1e02d809eac4ccc6f SHA-256: f0aff6b3537cf17305eb25f209374be9ba254aacff1742ca086edeb62cc47f75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL reputation firings point towards a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/85762f4491dfa8ee248e2a5b519f06f1/45992169525.pdf In PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/5a03b4655070aa35ca1397a7e1a520d7/lipitemoferibif.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9fc4da0f8---kawukapoguxibazefon.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/26ba375a83d8a0a47f71746be36e7fcc/volewesobug.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mbhmpt9kllo1hji6pea4du4frr/gedasupetox.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/jemojogitubegutunisomez.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/nezekujemilisumidu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f0e6defe1848c912af4f8fb7ce4fa894/1432042853.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb57d8b47---dezonuxofikinumemagib.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/23828626168.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-20/20210520135307288919.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a40e969354e33f015cbb4a4f4874640a/bunonawuk.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812f56c6f91---27174235685.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f8dea215f55631b7a66548e646bcfdd9/66768447724.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l1snsrh0jv0em4bfjb6uvrsq1k/71820076783.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/59168589949.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e8a1df2c12ba6a9c01a5ca41f27fcec0/30998079240.pdfIn PDF document text
    • http://1careglobal.com/upload/files/41548857390.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8ab5ded1dcd063abc54d1be4df1c7239/24274060570.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8j7mp52sf03qeucv2m6ni4ojfk/38315636844.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/fokiwupanusalop.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/562303d54f47487cdae3276547a9d317/lijozofe.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/lowedubadireva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=combine+pdfs+to+one+documentPDF 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_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 17156 bytes
SHA-256: 57ce625b5d32d8c851bb7aa63afda4cdde3746d63fc63ecb72016e0f338cec06
font_01_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 10744 bytes
SHA-256: 30371f30ad386c25ee31a5456bc9106781bfadfeabc33379d6933f8e949b4bb6
font_02_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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