Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc15c9e56d05db7…

MALICIOUS

PDF

89.8 KB Created: 2021-09-15 14:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e6993acdb5c0dc7bee175fa8db2fe6d SHA-1: a83be7437ba11c2e8b2a19e5bdd21e64f8596a97 SHA-256: fdc15c9e56d05db745f8dbf4753211b8b648054d5a113115f1a28daff604fd6d
196 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 or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://questyme.com/userfiles/file/komukorot.pdf In PDF document text
    • http://scamps.biz/userfiles/file/72465363828.pdfIn PDF document text
    • https://airbays.com/userfiles/file/naxepodu.pdfIn PDF document text
    • https://advik.net/userfiles/file/11781164890.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xobozopexuw.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/55065798776.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/93792378626.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/97911290902.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83838586689.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d171ed7c60---41481867780.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/lepufutikukowise.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/32354940714.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/roxom.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/nuvedagalekipugive.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/voselagalujitoxo.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/49173813003.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfffcff53---bifukivas.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/pupupim.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/7942845091.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906172212_1379675976.pdfIn PDF document text
    • http://cosyromania.com/media/file/wuxabakonegijekalovezev.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/watokagumuvesagodef.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/81167443088.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a61223af---18614072592.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/82788100831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=is+there+a+firestick+remote+appPDF 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_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 10640 bytes
SHA-256: 3a29e2f797e094ddce9dc989a783cc53d7020168ed43272884435c5fc20d6880
font_01_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 18396 bytes
SHA-256: 01801df1cd4077b04518b555b2b9c9fa38a039e1f17feca575baa0810d932949
font_02_sfnt_off0001410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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