Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbc79183b0d91e9…

MALICIOUS

PDF

70.2 KB Created: 2021-10-13 18:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b429bd5e587116f905dff404caba33fa SHA-1: 643c4b19828ed6470f9f677ebf02098c57488456 SHA-256: 1bbc79183b0d91e94e80e7d1d4965d8337a7d1dbc85455a3dece1293fb86454b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=new+construction+home+inspection+checklist PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d0b9ae8b1c33bb5b0f75184c027a989d/49387864500.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ac59edd7f3---3840696696.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/mafejadusujug.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/nowub.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/28656848427.pdfIn PDF document text
    • http://thecuriosityshot.com/panekojenefabebufe.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/powufajelumin.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/bipof.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/82814684771.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/bumugowatiregefo.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/bazobuvusasinizuropa.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210925_B786A12CB69BCACF.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/11418213487.pdfIn PDF document text
    • https://themalc.org/files/file/93869569957.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/64254482782.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/lolur.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161481e6b79dca---94288824822.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/towexevenifeno.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/47330608963.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/7841541395.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/81738912592.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/19895796124.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/zujeloriri.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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 14788 bytes
SHA-256: 5d766a4a91bf07abdf6ca69e989f16db53f1e4e92d43a679422a143e9960aa3c
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10732 bytes
SHA-256: 1f55248077c7aa9cbadf54ac206779c03439ed0bb8c9eeaf1e4a84246028bfed

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