Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76bb68c26ce027f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 11:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b5bab4331b974ef7511d272f037f237 SHA-1: 3bb47363ab2582c52a58eaabf59121b64eccb190 SHA-256: d76bb68c26ce027f1805e6dee5e1f8b116a99809de149136f8885afeccd8049e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the primary attack pattern is the use of a malicious document to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=suzuki+cello+book+3+accompaniment+pdf PDF link annotation
    • http://lamgi.pl/ckfinder/userfiles/files/72756794638.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/sezegizido.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/65931821296.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f36a2a02c---wikawaxusuva.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/71835392265.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/58050166576.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/32911046833.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/jofifajakowomakafek.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/mezimen.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/xoniduwunasez.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138789ca5514---wefapamew.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/23474107922.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/vetoboga.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/lisovokegirok.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/wutufirileva.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/69700313781.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/wijapixemodanulisadabodub.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/45159765312.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/56269669226.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613867d850643---rirap.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_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 11152 bytes
SHA-256: 5227ab7ad1611b7d5adc711d4fba4d070fa44e4196434111650213cec81df45f
font_02_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 19012 bytes
SHA-256: 735b27238e30adf6695e0c6cecd46422fe34985f98af727a5bd388e7dd1dab61