Malicious PDF — malware analysis report

Static analysis result for SHA-256 753b0480f25cc41c…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 22:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9985ab414473b68945e45607a027ca0 SHA-1: 3af65bb66c08964806357864dc1943b2d2f2c33b SHA-256: 753b0480f25cc41c62708ad5d64e16a6f336d2a9b3dc24c6d42f7b188959f228
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://solucionaesp.com/ckfinder/userfiles/files/lavotej.pdf In PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/dugeginelodisalaboku.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/35809348928.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/47373479064.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/66083735318.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/vebidararop.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/22249335122.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/vopomivabe.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/xawiz.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/pomawaziwixuwejabaxisili.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c2db64eeb802a59d30eaea04232c105f/fikataliguzif.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/fidatup.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/gubazivugonakowovalo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88c813798---gipenusuxojapuperuxe.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/lamodubade.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9702fbf2---setikusipogev.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/tesumaselane.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/21582875811.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/pituxupuzotulumikuzuno.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/43845097610.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/posulekejerumo.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/nokotiwopepobibemegiw.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/sifamojetomeb.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/xevubatux.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/vopudolakibetapogupitor.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/26107960902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+accounts+with+passwordsPDF 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_off0000b98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98A 10852 bytes
SHA-256: b8b5084d7259451cce18b88ebd5381fed6201fab6660e2528f4bd348f17600ad
font_01_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 18332 bytes
SHA-256: 76bb11ead968b41eb49d1fb3769dfb737603e88f17721d3f557a13a06ca39dbd