Malicious PDF — malware analysis report

Static analysis result for SHA-256 634dbb6f5890ff6e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 23:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6756f944be96afe1cc1fce9a0351a4d SHA-1: d934662ac6aeaf98de68a41d748e100cda08a4ba SHA-256: 634dbb6f5890ff6ebbc671809c566e5d90b013e27e2379e4e0a016cc20af404f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tuclubcr.com/campannas/file/loledakupagixarivafiwuv.pdf In PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/85959917030.pdfIn PDF document text
    • http://abnicum.com/files/file/tomifixiwizuriwikisumi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fuxudilewuxedisetagew.pdfIn PDF document text
    • http://heureka-cz.eu/files/jivezipajolujudividunaki.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/45271183412.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/fizeduteveximiwug.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/nufikenepados.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/65274174786.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ec56072e---jefeto.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/63791208591.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f7e84508014802ab859fc3cae5021a60/45020044788.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/firimuxep.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/63cfd04df0dba70e7397541904e119b7/25995249448.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/55413852868.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/96932232802.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/25066951381.pdfIn PDF document text
    • https://scalper.ir/data/files/file/49533160773.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/22975393871.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/80975737239.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/pipedisewasafilenidef.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/bonavipapetuz.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-12-00-48-41-17.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/25415608448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+voicemail+is+not+working+on+my+androidPDF link annotation
    • 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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 11064 bytes
SHA-256: 3b82c040ef97b999150c6a6297f327e7593958ae434d3cd6e31b901c99d22e98
font_02_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 17980 bytes
SHA-256: f96f2e7e747786a028db22c813fe3ed84a63a4638c7af6d19b1395504994c5ec

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