Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec3ab0b386e369f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 01:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e4517531f41fabf74b3162ddf4910ec SHA-1: a6df1d98c8bef40d495aaebd9941300da86a1e24 SHA-256: fec3ab0b386e369f13137a985c7944873589588cbcd7c3c19f49bb6798072bb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for initiating malicious actions. Several heuristics indicate the presence of link farms and compromised hosting, suggesting the document's primary purpose is to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://appvid.eus/userfiles/files/9421070200.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/15683216639.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/goweramesa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16102fefe10d23---77406748576.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rimugidegazuvibu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b988bfd3e---43903594203.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/sujikewekajujonadobo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071c97d5893e---92837162482.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/fevurazesabopoxe.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c207c0e74---vokufozed.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/mubenulobalotabokabija.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/duzabizesuz.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d39e6f430---gegilusonitex.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/30378715319.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/biraresaxekegufotuxe.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/43010792176.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6e187a7ef---46159681755.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/toxibivusajutotanewo.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/susaniwiwutamimu.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/5205371268.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/98271861268.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193e35dbaa---kitawumukebotidudonaruwip.pdfIn PDF document text
    • https://msvadba.ru/files/file/22136811772.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/tigevexin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+human+microbiota+in+health+and+disease+pdfPDF 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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 11088 bytes
SHA-256: 50be3bea701bbd8fdcd0e8aec417d41483791dfa78da08676663ca9e98fb66f5
font_02_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 17696 bytes
SHA-256: 085f7836c95ca6fa62b053bea5c66ca684866c79ead582afab6e629ddff4ef4a

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