Malicious PDF — malware analysis report

Static analysis result for SHA-256 788321e1e1c89442…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 10:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ea77dea78c419b92165cd6113de97477 SHA-1: 3564f1d40db9bd29eb5cacdb3ced0366312d1dd9 SHA-256: 788321e1e1c894429d5f7c029a2ec7210fc481f3ba9d1509c954601e44fae265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9d2319d6151eaa5f77a9b07dba56cd36/23037018901.pdf In PDF document text
    • http://biznesfishki.ru/files/userfiles/files/2025700220.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/nales.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/4691981691.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/roluzitusavakexatodar.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/43556607878.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c75539097---12887664443.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/32795160583.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/8603404630.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/poreviramasotusiwuj.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/jinarelisokepipeguwo.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/77299513702.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/xuvanexovosogegin.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/93400549764.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/sunokabo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136037387795---xoweredusijijuf.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161359b0a945f9---85074475129.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/32003265533.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161519c5550a57---45513313046.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/71270416230.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3375886b9e6fd1561479bbf6089b6f18/18555466656.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/61708379458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hack+drift+max+cityPDF 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_off0000b075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 10368 bytes
SHA-256: 044e6aa1e357459c1d3a458f2891c13855583038c9c20f9d70be35e20d89d301
font_02_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 17580 bytes
SHA-256: 2974554527fb60d56180c2717928e3e931ecdca525aad9581e4f842215cc568e