Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f3c9a209bd9582…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 22:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f1cb3a22928429dd0fe87af0a5c30dd SHA-1: 60f1d9333a908f527cdd9cbb4fbee682716649c2 SHA-256: e5f3c9a209bd95828e918f2389a1a31c75bb5452f667f99aff694c4a2c4dde30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm the malicious nature, likely involving phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=epic+war+apk PDF link annotation
    • https://lideregitimpaketleri.com/calisma2/files/uploads/78286838741.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/39599609159.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109091707592129.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/47efeef2771e2da19bc01e2c5970211e/72585432027.pdfIn PDF document text
    • http://contelex.it/userfiles/files/vekuxuxatodusesu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161312d1bdbe28---xomemuzuxoz.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4e5330e16fdd1b82fe335cf1759f4d0/1423944743.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/84233943854.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kadipanexejemabob.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/66272539163.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bekunuzezunined.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/lapinapokitoje.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901210902.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/95418893326.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/18520858258.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/40464610046.pdfIn PDF document text
    • https://hoalavender.net/upload/files/93200070861.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/66796883175.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b55dc882---78591185979.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/dasamakakizajezuv.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/11330331457.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/xegonudajabekegikajutebe.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/jotujodupibarov.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/91776938258.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 9860 bytes
SHA-256: e038267de0b356ab334cbc9acc9a3c834e8bcd0a55adbaebfdbf5c94289cfd6e
font_01_sfnt_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_04_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 22172 bytes
SHA-256: a466bc8a38c177c574917146b9b802bb9a70eb62f6b5972daf937de4adcecfb7

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