Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b5036c5c289f38…

MALICIOUS

PDF

72.9 KB Created: 2021-10-03 03:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b077bce2c781599e286b7639e3610b98 SHA-1: d91f294694ea8a39f901fae861a7a3a5c473f8a0 SHA-256: e4b5036c5c289f38312e73d060c1c07f12f274a3e94bed79d4f54bb82ae71365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=meters+to+light+years PDF link annotation
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9b97453ed7193d008abd0cab31584ddf/vomexujoxalezopofew.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/simikadefibedafotim.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/nawupoxizewirinuv.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/3742343657.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615063f0aff25---tatapixaxisowok.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fovosojurofupa.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/zesenes.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/foralejibatugobavud.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109161338434333.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/41185092946.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed913df30b---zogufulupufokawurodas.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jemaxawifowarepawamomufix.pdfIn PDF document text
    • http://methese.com/upload/files/junojag.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/femitibojarefebobavew.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/38912455434.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/sojudenepuri.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/mezorarifaj.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/knf69jgqt614sj53b1hscqv435/kusuvawibubetujifeje.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/savedupaniduviz.pdfIn PDF document text
    • http://vladekoservis.ru/files/laviraroziligoli.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/butejukalawo.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/78501833439.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xugaxamobutowofele.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/fimalaluzamotik.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_off0000b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EB 10392 bytes
SHA-256: 80e8cd881e327e3cad730667b4edb22d2552f454f35d287556b1245a30350d67
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 18788 bytes
SHA-256: d7b48dc8a680c7bb8eed385d347f2ea6c2f5b95ba5318ec404bc9e08d8decdcc
font_02_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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