Malicious PDF — malware analysis report

Static analysis result for SHA-256 781fb2e83e418f69…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 06:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68726415919fa416aa525dd4bf9ae6d0 SHA-1: 916acab1ba80ec8dc12167c28a14d8fb7aac3c7b SHA-256: 781fb2e83e418f693c694223329a0e0f522fbc302bcc860a542afbe5c8490102
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a callback lure heuristic further suggests a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=unmigrated+full+access+minecraft+accounts+free PDF link annotation
    • http://nuovartea.eu/userfiles/files/36796325390.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210918012004.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/73950935537.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9dcbf6b3fe74900968e1a9dde99c10aa/63883665631.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/forur.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109010601186592.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/zeluwatatuma.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/limibegajaveg.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/gurun.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/dotelatebija.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c19d1b4066846490cf47b9f9b5ecd76c/zazarunepevazojotifapevuw.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/60143825822.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4fe522ae---noxuko.pdfIn PDF document text
    • https://tekmaker.com/upload/files/47045060308.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/tarazega.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/64633466885.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/55859627098.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/povarawefon.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/bejizodedesurikotut.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/sezisa.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zonikogadubefadolisokulin.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///zefakaxadukuturise.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/84484989219.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/pideregugodi.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_off0000b04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 10928 bytes
SHA-256: 9ba684f012c03379cdfdd6c82f204a831c433f5ca28b4f11bfc3bffd0b44a029
font_02_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 14404 bytes
SHA-256: 87e13a859c981b34049c31ebdd25e030f92949d9dcb17eef3f47e3dba70bb0de

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