Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a2cafe39e85f9f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 13:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3506644456b9d04f89b393fc8e0585a2 SHA-1: 5aeacfcd7dd0738de9cf24346a470b67285967ad SHA-256: 15a2cafe39e85f9fd3d82cc0f68e5b2fbd02039c60766f0cd77e281cb521e801
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a callback phishing lure, prompting users to call a phone number, and also noted it functions as a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it's designed to redirect users to malicious sites or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=hack+clipclaps+2021+apk PDF link annotation
    • http://lookkorea.net/userfiles/file/23568281336.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/30380670712.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0st14s7v5s7uqd45btih5runk7/68883690533.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/66792327706.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/bazibu.pdfIn PDF document text
    • http://kezmosas.hu/files/file/wuvuxulaso.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/73022181709.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/mafejipe.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f0032f905248d051b35b9a0190cb69e4/foponaniraxiw.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/57195940694.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/15382911560.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/fanewagebobebaf.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/giwatijumejugigito.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/1022635657.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/4216340495.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/12240571121.pdfIn PDF document text
    • http://findusafranchise.com/files/files/laxunolosovemutir.pdfIn PDF document text
    • https://robertbah.si/files/file/40246313397.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/vitadamatamuwativubazope.pdfIn PDF document text
    • https://brukspec.pl/upload/file/89248587659.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/numuxox.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/11192772220.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/5176529338.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161393ea0929ad---tiritiburusobafasaji.pdfIn PDF document text
    • https://curvy.tw/upload/files/rilowomakozemukepamasoxu.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_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 10188 bytes
SHA-256: c7732ebb8a67f58e51ceb92cd18bb846ea0caeb60e541d89c7d3abee24b46528
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 18456 bytes
SHA-256: bfd825a893c1763a2220a2eb33481febafed8c05550a92b413f0bb6813b7d3d7

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