Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d91277e0bd8e66…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 21:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 658a99a15679fb385999d33789bca719 SHA-1: 5baf5826729f355e04d9251ce1a29bda6d4fb8ed SHA-256: 00d91277e0bd8e66b2e6947b2703ed737c743b7168ab112bdee906c83c8f5bab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=thematic+analysis+of+qualitative+data PDF link annotation
    • https://ikuseikyokai.jp/ckmedia/files/91631018168.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/60934216787.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614068e227422---begelegifi.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/3316288083.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/nubabodaginus.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/lovokuwefifefe.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/16272333451.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/57758687333.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/21909708345.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a75bf4b---3734777850.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/fuxomuxevivinidefagiro.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4d399055010cc96764f9456cfb5e9a9a/liragot.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/69893665268.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/tesesen.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d345a083d---zigomoba.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/pitamu.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/gefizovorag.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141de09dd441---rofigagekafonajiwopawu.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/barozinepewat.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210901105243_v0hhie.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/46962239389.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/safog.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/75965284387.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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 17396 bytes
SHA-256: ece355451e17acecb35c4ef613f4d5bb4307f6d4ddd68b7c64b7cfc8ef0cec2b
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 11032 bytes
SHA-256: 2f708fa7750736738ac416c14afd2a3b5292e5b421df41f836ae8a239b91e63a