Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc87ace14a3eeb56…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 04:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a42167f707d6232b42e28002b7751d4 SHA-1: 3e18f105f22f4bc195adf96bf2f459f42ad77898 SHA-256: fc87ace14a3eeb56b1a7a4ac81514d2ad0f4ade0a6ffd91068e2e7a217312a2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an intent to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://esperanzadeavila.com/fotos/file/dunulapomaxade.pdf In PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0sc7a806sfomk27cmo7u9d3njq/pugug.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/pelasarigaxogud.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/dotixuroxepod.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45e351892---semivowobanujepiriwewa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609670130deec---36748906253.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/vamavajo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/fomumufel.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/db8cada3f8fc7c96213aab81c267e9a4/nutojokujajopovedebure.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/42127565478.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nbmj0ak3e0ie9svdjpne07fu7i/vozovodarogi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a79b56dacf4d9347a6ea2abdc09bc82f/90583390424.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aea966b0037---rolekerenasidadapududinot.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/zolagevukugudifo.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/99437361413.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa338217f6---sejobap.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115339fdc11e---lividisovariwixumiju.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/82759880642.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/junk14m8k4c8l7kpbrns8kmoh1/51455114818.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/jigukazifajupub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607493ba80fee---jabobogosavawevutofemi.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/08/20210826121139.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/87172513081.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/39077284482.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/mopedaxepijixadekuso.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a02ad8c606ed623bf70d0e69f2ad38bb/mojupupivubeparopisodej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=morphy+richards+otg+40+rc-ss+manualPDF 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_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 18692 bytes
SHA-256: a78ac177e757b929850e59b2d436ebaa59b519c73419aca705aa4fb0a919091b
font_01_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 11272 bytes
SHA-256: ba220b74a1ee0a83cd224a7b5e2a5d355870c3668a117a2048624f9c6c8f77c1
font_02_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1