Malicious PDF — malware analysis report

Static analysis result for SHA-256 c655ed395a6ef44c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 02:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95e9c743448aa75ac199129f54a15790 SHA-1: 013635cc52667827bc9568fa3996d98125434b48 SHA-256: c655ed395a6ef44c1c1818db731a76f04e576bc298f6508cb6952d090064ef7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or compromised hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=how+to+hack+real+football PDF link annotation
    • http://hueide.com/upload/files/60007141173.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/32337107404.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ac191137---75825234388.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/14edff695af076e11f9328adc14dd6ef/55456053360.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/norivi.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/5502128570.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/38188199267.pdfIn PDF document text
    • http://fxlcd.com/upload/file/25710025662.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/kizejexi.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mejitakomasijogobobexige.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/40798228765.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/31422652795.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/robuwesemo.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/54276562645.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/68745484882.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/43491488297.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/tafuwojixalebuzagakos.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/87380991903.pdfIn PDF document text
    • https://digireg.nu/upload/18239999068.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/dixuke.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/32950642397.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/rajafawumexewusexoximi.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xawaxoturowojalaw.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1403_20210910193246.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613341b0b9a8b---47435269741.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://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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 10376 bytes
SHA-256: d7e1a8e3bbc2d647acb86e9dba536d938bf119294ffeb99ae7c049dc3b91a5be
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 17040 bytes
SHA-256: 79cd09427e6000235f50682fc3a99ac0a6f9b9d25bb85babb5616767b5a0f405
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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