Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf86ede71dd0076…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 10:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d1e47839242fe4fa952b3796e463331 SHA-1: a0fb0b63285ce89d83641297c04cc0981cfeead9 SHA-256: fcf86ede71dd0076af3fa53b422f55340a75f4d11394188e2399743207ffc81a
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a link farm hosted on disposable domains, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://gdlejia.com/uploadfile/files/20210913_195900.pdf In PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/xopebixaxovuvamirarokikim.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/43739822725.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/80758394734.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/xaguwabojujila.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/53526481817.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fab791423---87974221204.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/moposazupawifuju.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371d040df51---warogesebekelurozapofizof.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/79181753074.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316e74cb0c5---kopitazigurodexagesudo.pdfIn PDF document text
    • http://ilovestory.com/upload/file/69771022040.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/vimajaxomogikumime.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/93921711927.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/dadaturunovuwibijesugim.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/655088242.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/kolefigetabojuradevexid.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/v5i21a1q910ao48t08s8k7hqj3/ninovijamunimebubewuj.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/nemove.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/jobuduwurini.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/lawegasugal.pdfIn PDF document text
    • https://tebra.si/userfiles/file/nofiwipobodumipo.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/tumavazuxasibapasabakazas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=call+of+duty+cold+war+aimbotPDF 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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 18036 bytes
SHA-256: 1d1c7e2cb185203955547c76f43ae640029bf75c8956fd82bd472f16f1fa3505
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10704 bytes
SHA-256: 94b2465d50e74814eab70ad2ad48dca43e95db33b5bd1462bdba34125abd1cef
font_02_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.