Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f767333bbef2c0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-22 16:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a51186d21b0a1ab4f96afe15a4cb5bc8 SHA-1: f40eb8e054e97a05677596f083b0925d5896590a SHA-256: e8f767333bbef2c09dce9d96e5ff2938dd4e0a77421b435c1452010dcad34e39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=12+rules+for+life+free+ebook PDF link annotation
    • http://aatmicscience.org/asuserfiles/file/6999754893.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/lefawatexejujejinerez.pdfIn PDF document text
    • http://licausi.it/userfiles/files/89089671836.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59461600509.pdfIn PDF document text
    • https://luminex.pl/upload/file/sakuxirizutoradazozanena.pdfIn PDF document text
    • http://smogy.ru/files/files/wedaxuge.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/46782619335.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f8609b74799c966bbb6771a15025e2b/zezapufariwotoratowuwon.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/jogigedemunigixanaxox.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/48180240975.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/10160405173.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lozonuduwaxituvovizokizip.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/funonejizunalekidawe.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/bafifine.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/49385601696.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3af3e188a8226a1b6e072be5366d7c21/95697404530.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/zumomijibozi.pdfIn PDF document text
    • http://oris-am.com/editor_up/ratagixogarikakut.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138be35043fe---lakinuwivimumer.pdfIn PDF document text
    • http://parentini.it/userfiles/files/10655974946.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/sisoxapafikivibugo.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/46842477951.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/vakupisujubavud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 10252 bytes
SHA-256: fb852e9a96ce1591927784147e325b3bd173e3659e8585f897096bd63cc6a404
font_01_sfnt_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 15692 bytes
SHA-256: 91bd467a93cf5845ce2543ef9e1ea8033f6b6bc96a261ca0828defcbb2c5a866
font_02_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1