Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aa3bace3647dbf…

MALICIOUS

PDF

103.5 KB Created: 2021-08-05 23:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a77e3a0070694793306b96b38278f868 SHA-1: e52ccbe5f7fc03d6dc272cb92daa4fcb2369b101 SHA-256: 17aa3bace3647dbf715ea8d6373d2850549c3a96e2f031b6a84c7968d79b2c39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hd4vpjkm7v5ql1tqklm0qacou3/sezemamisutuze.pdf In PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0lssj4l3vlvloi6k8ra2f2flrh/fukumufulanulefawapo.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/25800606944.pdfIn PDF document text
    • https://irrisyst.eu/files/file/46904986653.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/jibatinamilowepude.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa7d0848c---tipasumopenuwaworuw.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/47528604295.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2078de8f1---77219587150.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/20826134418.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf904377bfd---sagejeriditisununiva.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lbirnrgs2fdju8pe719b6c9ck4/65532488196.pdfIn PDF document text
    • https://securitydm.com/slicice/file/fulerufoledirepegaloreb.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/25966357937.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093f698185bf---welirusexe.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ermihk2fqc2fg3tje40svpu5gi/jafagefalosevekafepijob.pdfIn PDF document text
    • https://marosme.ro/hirek/file/43728716012.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8ae8dtk5cup5amrcrmton77et1/josuvutaloganopadizejiba.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/61379350973.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/26747922390.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0b1b5b23138064b4cea1865e53b0da93/davosegit.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lidaxejiziminevabu.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/cd3870289721809d527ce4d8ac843105/68350081200.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/divadusiwojufagukadawatag.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/noforofujipojel.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/l9u1at28qffu6l2ujbp735o3t2/64453268250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=scott+pilgrim+vs+the+world+comic+colorPDF 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_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 10924 bytes
SHA-256: ad86a64a49ecf53086eb738262552255e0a7c7a0db9c07316b413491c099b5de
font_01_sfnt_off00014683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E95 18116 bytes
SHA-256: 397f8368c30616a40eb439ca4b0eee4aed4f644c436c07926f99057fb19d0c9c