Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41db4126e032b32…

MALICIOUS

PDF

91.2 KB Created: 2021-09-21 06:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b8e91117096044d72afbde835974113 SHA-1: 7a15738227e27f9ddfc11b22f05a90cde731bc93 SHA-256: e41db4126e032b321a20a3a65423c5b9c081611fe86545f9b431dfba91be9c76
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites or engage them in a fraudulent phone interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • 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.
  • 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 http://vipacademy.org/userfiles/file/39310993882.pdf In PDF document text
    • http://1careglobal.com/upload/files/pozokazenejorisumo.pdfIn PDF document text
    • http://ijfbn.com/editor_up/xifegodibow.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/kinigokibimabewaf.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/68248387067.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/73992585630.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/54302494032.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/sariwonabifevuwedaledoka.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/megekidevejuz.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6kle9gc867tum9ak9q4ufl77cl/tafozazaderuvuxuri.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/92302756661.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/pofezava.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/77052384870.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614883a4392f1.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1cb6053b---dewowuzapiwanubo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/700ff236b6b101d0d65eb812262b8606/famiveduwenuredi.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/26626275083.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/62780966150.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/tigujizopapawufisizif.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/difitobadafige.pdfIn PDF document text
    • http://nensi.si/upload/file/61427344536.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/67095216383.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kuroka.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/zarovawikevo.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mapavotoxonubo.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/fifowuxefemaritonife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=car+bridge+apkPDF 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_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 10296 bytes
SHA-256: 3ce835e304d4b2d2c8e63ca348fb5772d90ed3d46302357439ff42c75183e030
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 21180 bytes
SHA-256: 0322a7ddb10bcc175584204abe1006463e46b31d9e073090ac960f98c97e4f7f
font_02_sfnt_off0001475d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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