Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc513cd343d4dc0a…

MALICIOUS

PDF

95.7 KB Created: 2021-07-16 04:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4b2b1f01a6b2312d9ec85ad66f9ca38 SHA-1: ac69454b2ae4cb92669868b1a21933f9b3436eb8 SHA-256: bc513cd343d4dc0a4ed9732ee6c58a7aad280504f0526f21194c85dd20637b04
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of links to WordPress upload directories and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c972025---ditawubidalugajupen.pdf In PDF document text
    • http://zulassungsservice4you.de/bilder/file/pajuguzewarif.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/dozigi.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/97743ac861153aeb8b21e42966e72fce/mizusafi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ffefbead81704bfa607ffcf8dad64a5/25599366219.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/75245bf34a9d1c6e2610be84d28664a5/ripiruzugulolozowa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51bc1c7a06cdc3375ca325b77b96b93e/zurozegixiriwokigizesota.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/18435299207.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d04ebff1---53401726874.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4f01ce21---rikojemudo.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nerodigenorunepuluw.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-2/20210702030449794864.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/39705262376.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/30078115376.pdfIn PDF document text
    • http://cmtsport.com/pliki/54756377651.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/98382287599.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/metitazirexobi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a6312365e2e---9589910644.pdfIn PDF document text
    • https://curvy.tw/upload/files/82226040266.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kosepa.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/p54pjb1h3qg0uf26in6lqmkskq/lezowajawut.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b69d70cce9a---68235148111.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1ef7116df56f09a08bfb0ae01926010e/desevozamefot.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160872a669d92e---18936217084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mind+markets+and+money+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776757f136b---salobatesigilibako.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_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 10812 bytes
SHA-256: 9880cd506f234afc9ad9c938e4c44d9f1535fcfc5b0dde817b4d40af03c153ce
font_01_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 17652 bytes
SHA-256: 9b2828d8b7bb5032d7fa0df16827d36b823f5798e79d5080be8b4cc8c1fda585
font_02_sfnt_off000159b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1