Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3894d752405ea0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 01:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5586bd157a11db2a43db70d50fba884 SHA-1: d409a714390fb5bb8318d91ad588118e094faf72 SHA-256: 3d3894d752405ea00b13ed804f9e6aa572a515ceda1ba3e9a1b113eee58bc844
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of a 'download button' heuristic and the use of 'utm_term' parameters in URLs suggest a phishing or scam attempt designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=iphone+8+plus+stuck+on+restore+screen PDF link annotation
    • http://jedzenie365.pl/ckfinder/userfiles/files/xigototitipolagexa.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuvafawowejoxekulajabarir.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/gikipenidiwanuwo.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/33267983796.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/sujefu.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/63904726902.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/laguxidefifuvexaxojowinuk.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/80426646835.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/pixiregerujizaf.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kipofijus.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e939906d---68663286626.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tojexobate.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ec8a339a527650ed10a95cba6d8d20ac/paxunexugilojeb.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/numajated.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/30372325878.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/bamimixajebejakizafiko.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/71556416740.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/soradexige.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/xajopovakumazoda.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/79547003291.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425fade1507---gibedutomunofokugu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/89776392298.pdfIn PDF document text
    • http://woykoff.hu/upload/file/32926493095.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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 18044 bytes
SHA-256: 60f9da0a3245c8f5fe9365612e006c8518c332bdc3dfe53d0b1a0561cb064974
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 10568 bytes
SHA-256: 979abbca250e2c856b9aff99bd4c19d6c379abe71c720261032cd4344014a01a
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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