Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc4a7256a595471…

MALICIOUS

PDF

97.5 KB Created: 2021-09-04 04:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d248058a7e77b1ac942371e3f866cf6e SHA-1: 1ad2845284af6b8ae5f11e9f5e555911ab1f1405 SHA-256: 1fc4a7256a595471d06c471a0091a826895cc3005c7c0d172cafd982153cd94b
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic firings indicate a high likelihood of malicious intent, specifically phishing or malware delivery, by directing users to algorithmically generated URLs. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://synerhu.ru/uplcv?utm_term=sample+concept+paper+for+a+project+proposal+pdf PDF link annotation
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/782d60c68af3a8a5362df8c53bf8663e/rezefexoxu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a663dtl64l0ldmbbus0v5po5b6/zigutanigadoleje.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kevax.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/39322320672.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/65221248964.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/94049191280.pdfIn PDF document text
    • http://fedime.org/imagenes/57678917721.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4qeuclvmh2iu9npk5hhec84f3/98581782141.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/92320000934.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/84354362408.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zokixiwaputolibapeb.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/42369679044.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9df62c869c49d87c8323a58ecbb6bcc3/87578982132.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b6b4821620b646cf8d1d95d5af20fbd9/95984423693.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160db3149d5a61---warerufepuwusumafudo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdfIn PDF document text
    • http://atek-ent.com/upload/file/20833111707.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nobarodaxurulamavizor.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00d27d82d---wivaxawapip.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a121919e2e---fupurizekasobigujura.pdfIn PDF document text
    • http://humanlitech.com/files/files/40268733592.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/62720652580.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2edfaf3b7---97610859237.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e3d0191d7d2a3e5786a2cb5836600f39/85792903998.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/mufete.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_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 10892 bytes
SHA-256: 32d0880cb77d599b50c6cbe1cdab5e31eef0c13d7e0d89473eeb0e950341b36b
font_01_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 19508 bytes
SHA-256: bde94f09043d6b0582b058355a748fb1ccc81efddd55831ab3787e0712259d40
font_02_sfnt_off00015fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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