Malicious PDF — malware analysis report

Static analysis result for SHA-256 780bc82fcc034f61…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 02:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62cd1fe6f1a4969c6cc640ee6f831725 SHA-1: e3858303726b21dcdad326d3f1caa14d3b86347c SHA-256: 780bc82fcc034f6106804ccc9b1b56db69dcb357ceff8ee828a923de4973c352
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous links point towards a tactic of overwhelming the user with choices, a common lure in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sammyuriasproperties.com/userfiles/files/vimawetavotowe.pdf In PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/85941006419.pdfIn PDF document text
    • https://iwistw.com/upload/files/pivozexodijasifetuza.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/rikewewebomu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sucd59jret5ui3lqqosknd42m3/95235537266.pdfIn PDF document text
    • http://metapolar.hu/tmp/fawaku.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16111f32b830a4---fimaximojisidaxuwof.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/zovinidokarikiwusaselevup.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99ad6ef03f120e0fa894264da60397b0/xebasujosufa.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/7359687443.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/buliseviwoxojaret.pdfIn PDF document text
    • http://islandpointfl.com/userimages/11391715493.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/46b66fnv4itft30v88svt90mn1/mukevoxivibetuwijotumotej.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/568032071a2ad34d6d42b9d8e4cccb57/15203631177.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/097bf772bc92ecfb4bdfd8e06d7aa4d6/kafabevomumukajifojaviwi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67bcf1f478---boxanovigelojijojukum.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/50597827303.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/3776191760.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/fijapi.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/46045323913.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/lopifufek.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/mavabunewuwunovisoronum.pdfIn PDF document text
    • http://cortabellanews.com/userimages/62446062572.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/tizebadexevivujimugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cheng+electromagnetics+solution+pdfPDF 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_off0000b8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EC 18160 bytes
SHA-256: 913846e376531489bab3e24b07a301b0e51ada5f25d8aae5911649da03aea5e6
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 11200 bytes
SHA-256: bea3efe8786d95af63b92fb81465ee23c0cc56f113a71b635e20a610d3c63b32
font_02_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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