Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53dec4f4538899b…

MALICIOUS

PDF

86.8 KB Created: 2021-08-02 11:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eccbbfccd9b88962504a341647affff0 SHA-1: 356d5994a9aa5b0c6b95b689a8e221bc42d1470e SHA-256: e53dec4f4538899b31827da7a289f60a6c857b2627fcbeb34a8c1d071ef99901
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to lure users to malicious content. The presence of a 'download button' heuristic further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://travelsafeway.com/userfiles/file/terataxiseterigugana.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160962d12bb1ec---9008027192.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0da1fa7f09---kowufofusekuvojapav.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/jevaletofojofivubejag.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/juwesatomulofotalasoluw.pdfIn PDF document text
    • http://air-ned.com/uploads/files/luxanetimijufemijafur.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/28058509441.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/de297c23862073ea36c0f311f1e40881/temodofawu.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/negazozopomurozosafeped.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/05bdd63c0cd48c44335618637ddfefa0/kiditidutukisigotute.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/wurituduxanovumamokugesag.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/pibitusedomeroloxozepo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/709c3df841dae33525de236f64d696cc/75714017338.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e413d5efe1---widijaxagizerexok.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zidibozukusomovaxufimape.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/58820799122.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9369b0e2---70897283413.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/40e6de1782299acd5d9f832896cdad55/79806045803.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd9da2738---63122103494.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/99614188992.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/95102854289.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/rexojeririsikevobaf.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/sobexewa.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4c958c67d5877ff18d19a1bb68dc055/56740319310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=alcatel+one+touch+7041d+flash+file+free+downloadPDF 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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 11044 bytes
SHA-256: becd74edebcbfb978ff8a02760aede417c455111f19906e4635dcbbc6b32dff9
font_01_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 17232 bytes
SHA-256: b57587d4ef6117f3f4c1713fb2cfa2161ba808533bc215e14ab4e0d0b7a71b5b