Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1b2af07f00e7b6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-02 00:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9f30641301b6128afa23d442cf3ce53f SHA-1: 68d507754646bf7834ee8d0dbd9f401dc1897312 SHA-256: 6e1b2af07f00e7b67de2f0c06db9913f0a851662f68a47d3f874e3e9351ad2be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://reversetheclocknow.com/ckfinder/userfiles/files/94122356303.pdf In PDF document text
    • http://bayanairag.com/uploads/userfiles/files/pajuzitigotikulonarobufi.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/dukaxava.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/renupinukosowanowom.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/uis80v2vg2tfpr5jq5dos4ef7n/gefamonovuzeli.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/95140642302.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/monulowotuzezejej.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/kinevu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/9304119885.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/rarewamuzajova.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/m6alkarpqrbb1h9ssmi0psr5im/vetodixorezig.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xokuvewegofedulaseted.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210822002710_zlnd7m.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/17398239684.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/jawasuzoponozudukapigijip.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d80cf3356---kuwulolives.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/69186764413.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/828f3ee3526f57c940ea5b7b333e43a8/seregedegexog.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nenop.pdfIn PDF document text
    • https://cargobull.cz/res/file/susupizereza.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/4667078838.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vhhqu7a4in2524goutc4dvmppp/xiluzimewibezotesot.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32aa3889f---98514448756.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786313aa3a2---10588031305.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/vakiva.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3d99e9ca9fcf2eac03acde915642981c/gumopafikaritexixuzidubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+attach+pdf+files+to+each+otherPDF 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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 10688 bytes
SHA-256: f7ea22d7c8e7de97e92db7c559f1fab14023f48ba47f75cc98147d7f3b8bf189
font_01_sfnt_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 13628 bytes
SHA-256: 53f4cd799b4bacd8f952e94383675adda319e8ab97b00a7ef794e1e9725e35db
font_02_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1