Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d73ef1d0b0cb977…

MALICIOUS

PDF

89.9 KB Created: 2021-09-08 00:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0ee5abe4418501d51d490bfb60e716d SHA-1: 6cf48a2612376ad4a9a72193677121d696ced13f SHA-256: 4d73ef1d0b0cb977e6fb9b398380d6ac73f797fbc196feb7064ca982cc6f8362
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=tribalismo+e+regionalismo+em+angola+pdf PDF link annotation
    • http://www.gulbaharsigorta.com/contentData/file/1813269497.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2769171---20632720737.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f165f9475bdfb744c70b09549f7e0be2/87814358047.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/697f8983097381da1b14ea805fd502b4/43298821056.pdfIn PDF document text
    • http://arablift.net/userfiles/file/73413152950.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/dazofumoguvejemajimebeji.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nepireropulal.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e0f483c741acf6117fdd8049e3b17d7e/43077171108.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/bivaf.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/24540315926.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f166be14d0b9dcadff6943cfa644b7c9/72483940735.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/56179123219.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/50074910723.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/17057136674.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/15528251362.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ba7f828d70519a49d9ef0e6448801815/jirilinogu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8e045750---xaxexowemaxasojejigiwem.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4e749a240d3cb023ab2d1316eedd308a/81626866797.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e745db09723---juleruwinuwenuxizomam.pdfIn PDF document text
    • https://xigmatek.com/upload/files/ritatituwesibixozibesug.pdfIn PDF document text
    • http://mopron.ru/upload/files/wamuwapofodonipogufezaset.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_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 18592 bytes
SHA-256: 918c19cd9195d84a686318a7d7d8504fd307f966a4960294b131bf187a859ac8
font_01_sfnt_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 10844 bytes
SHA-256: aa1985b2b365e38d59d69ab94ddd5b546eb09df064ab4e20e2ae6e0fea608987

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