Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea31acaa9aee2c9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 03:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbd3a8bae9954bc7f36a7f705b540079 SHA-1: 692d5e09a9d3df1aef1b7afd9f061194ddde2533 SHA-256: bea31acaa9aee2c90b7a95c422598d5eccae201aeafb058412979c0de1712390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=start+up+nation+pdf PDF link annotation
    • https://norservis.info/files/files/31611191903.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/pimabapofemeri.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/basewabe.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/sotuwumoguf.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/9151023682.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/nokoralukunide.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/17380671914.pdfIn PDF document text
    • http://otczenacts.com/media/files/mixasubulinubavufebiw.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109131925379826.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/18e54433791b4e2e29ebc83cc61b1e64/78808175963.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/kasoxow.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/5927831183.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaaa00339b---92403954645.pdfIn PDF document text
    • http://pactolous.hu/upload/file/93193346102.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2bjp6gc603b70qjabn095b3bh8/gemazifoliwenosusiz.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/wozavowus.pdfIn PDF document text
    • https://angkagenap.com/contents/files/mesewin.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bakifela.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/dewijajasif.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2796abc3c24ddde194c55296ea746965/9613065820.pdfIn PDF document text
    • http://bdsductri.com/upload/files/jitupewezekipezi.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lotoginepuweweketido.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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16148 bytes
SHA-256: ad56f37b2ac30c8d7f998c052661f96d6ac32105c4256e08dc09d59367162c8c
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 10320 bytes
SHA-256: 504868efa40786c2009184fafdffc28157b9b1095c3cf4232faead3f60d32239
font_02_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1