Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a179126316c9f3…

MALICIOUS

PDF

119.5 KB Created: 2021-09-16 20:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d10bf504ec78edafc29d891510255a6 SHA-1: a995eebb1c56ae1238808a8a11549c813904a87c SHA-256: 43a179126316c9f3d6c00f70396358674f849b05c99fe0850336010c32834652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://coretry.ru/uplcv?utm_term=homo+sapiens+evolution+timeline PDF link annotation
    • http://aromacosmetics.bg/assets/userfiles/file/xizojipudifutemasesivodor.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/damixiwesuladu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/24765015407.pdfIn PDF document text
    • http://fgosvo.ru/files/files/85426469948.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/10396695546.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/wofifozavexoged.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/pojakofavubez.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/72019872626.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210913165647.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/74294053167.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/werixofawusisalasosobojeb.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bc3dabea2---68989121582.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c44ad94cf50971637ed50dc7f6a0a58a/15644380740.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/winatapanotujegaxobabipak.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/45864742285.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc1515d445---vapumuxowaferadizi.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/13521704640.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/53418722155.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/93640698793.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff17ccfca---82442795683.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/34570728296.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/13135493387.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/zojowepinofupetivove.pdfIn PDF document text
    • 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_off000156b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B7 19612 bytes
SHA-256: 1e71639295a2422558e9f212ed55f176147315cdc1e3b8950167b9f559d3afda
font_01_sfnt_off0001898b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1898B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A19C 16288 bytes
SHA-256: d5e0dd2f10a1c759525e78afe9fe4b5c1f1dfeaf47bc7fb1e408acff0d3a0d50
font_03_sfnt_off0001b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7C7 10468 bytes
SHA-256: 1f65cc4a5b8bf411cc39504fe4ac86fa26b709a2c38b30b172f66a1d3ae52d42

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