Malicious PDF — malware analysis report

Static analysis result for SHA-256 852b2fa1174b6c43…

MALICIOUS

PDF

99.3 KB Created: 2021-09-08 21:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2604caa17acae6a17a951d681f560375 SHA-1: 7060f2bc48fedbbd58f0c5f52d8c1eb02a09a3af SHA-256: 852b2fa1174b6c430366e2849624dcc15ccc3ed958ad0434390132a2b9f8dbdd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by directing users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=aeon+labs+range+extender+manual PDF link annotation
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/45830066840.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/29ef166130ef399308a579d27f4ff87c/56360805510.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/97871810592.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6a54c8cdf3694755fa4903a6519a5000/22016982960.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/43174685536.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/37815199962.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c1e28570---10134086904.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/gujuloboberujunulaku.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jojijujozowuba.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/14339d6536398775b80f27edfab588a0/tizivijosaxavupafim.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/sevarabem.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161368cbb601c4---wozadevujogubawozeli.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/wafigagisevubilab.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/turuwifuze.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/44654419013.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/74135718280.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/lutorejogovute.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/91678201411.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zeladasokogozuwanebewuwu.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/xefilemexapivafozelef.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/29401914341.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/14699388885.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161388b3505e95---sexavode.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_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 19748 bytes
SHA-256: 889de2d6e507b3e6baccb36cfe5a623147d206489a49d835391c21208b8ce47b
font_01_sfnt_off00014e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E87 10820 bytes
SHA-256: e5c8a6d2f5c7797c456921cbe96a2c50e5529711c6390e8b280c38e798cc5a71
font_02_sfnt_off00016761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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