Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c45c16ad5a15f7…

MALICIOUS

PDF

138.5 KB Created: 2021-09-06 17:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 413ed1f57694679005908b4f3038f782 SHA-1: 81714e85d64ed63ca426a70edb66d04101d32ca2 SHA-256: 83c45c16ad5a15f763fe7b4dc8bc40e8deeabffa60b9d566e4c889bc842f7d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://archism.ru/uplcv?utm_term=freertos+pdf+manual PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608045d326240---wazovab.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/11353023080.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/u5akspam96e5tcm6vqkptfnjdi/tejisiwumoxipatetarumivol.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/vogefovupesem.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/befex.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/67108015957.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb0090e32---dojozunabosaz.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/86981187264.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/36186978397.pdfIn PDF document text
    • https://people11people.com/uploads/File/20257304272.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/99433511243.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/106355846.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/eb05bd0177060a0c44df72999a2ed807/pusubutogafebazowizutixej.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b54964b2---70663433133.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/50546b6d2ea4951a1a419c7f46a460db/tekuxagal.pdfIn PDF document text
    • http://jaatkinson.com/userimages/zowufusigenarebubozol.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e6734e10---20392914220.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe620beb97---71825560478.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81ed54e49---13645223661.pdfIn PDF document text
    • http://kyea.org/imageuploads/xirefotilubasagatofubuk.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af5341b31e9---51916541840.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/48491836673.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/fijuj.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708bb5478d1---1361588016.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_off0001b64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B64E 10644 bytes
SHA-256: c366c3f2c503d304ec47ed60b74406a454ec1243021fd8f17db91ac57ef8f219
font_01_sfnt_off0001ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEAC 20084 bytes
SHA-256: c62f64fcda511e7085688445f0ef392292846261053ca5a5e193ef82c86baacb
font_02_sfnt_off000203f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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