Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ecb50e5ad78720…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 02:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e63c2cedbb39a30117a313b83c1d1e79 SHA-1: c20109ec59475ec78977c80eba861aae41846837 SHA-256: a0ecb50e5ad78720d04571d1f0e9784a26b237701b317504e45b992b6a0376c5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading additional malware or revealing sensitive information. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609447a941f50---83022066689.pdf In PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/sadatoj.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/piruladomojof.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/dumatiminizogozotetosod.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7b103491---39879163381.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/t1rpt25bbv99ls4otp846gdalk/xonalal.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/41709785575.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/241164859.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/70962793980.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/60398961105.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/roxoxop.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/94312098909.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5e6aqupqcqv9vjqm2ndr18v135/pemizoxodimokegesopogid.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/jukikatojujubomek.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/52842574152.pdfIn PDF document text
    • https://bselink.com/userfiles/file/gudarisip.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/32619843110.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0a1k7qt1hsn1ve54om81a9g671/xibomutevixunefinonu.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/munuvopazetabirezofi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8fde9b96---dobitilibawawulovifixupuk.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/44c6dc4a011731d9a8045b93323eced4/42447271763.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051203484091.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/73131558123.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qgituciirr66p8i8qqfu7osno0/gukuwurilowaledimu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/4699809053.pdfIn PDF document text
    • http://tyextractor.com/d/files/50483638775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=convertir+un+archivo+pdf+escaneado+a+word+onlinePDF 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://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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 18176 bytes
SHA-256: c955e72f45be19499524bbc8bef7274617711578ea2ec0b38c2eccd568bd6c77
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 11000 bytes
SHA-256: 03031ba7a862b31832a24200c186610c3aeb32a93a401b0739d6988959601868
font_02_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1