Malicious PDF — malware analysis report

Static analysis result for SHA-256 037b04473aa47f72…

MALICIOUS

PDF

93.2 KB Created: 2021-09-02 18:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d084e0dc8f45401611fea235c2e8f25f SHA-1: ee85b19f3edc7ca8dfea5d660674d5f652832f25 SHA-256: 037b04473aa47f720dcfa62e63b390a716b4159eed87da2ad35525d1589ae1fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on a compromised WordPress site, likely designed to redirect users to other malicious or unknown URLs. The presence of numerous links and the use of disposable hosting further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5f352a9d---wumogaxeboxisur.pdf In PDF document text
    • https://cnn-logistics.com/asset/files/77522067321.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nafudonature.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/eae3703ecb0ef5ca70a4d92e11e50a50/17788978922.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/22579380871.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/un7a4f4fr3dedsu9ati61p6pr1/57699955117.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/jd8ll1qfdfn1g4kn3ujdq7c814/gufomip.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/vumurusiliwivuza.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/b7o6erknmq8cmanlnhe18ufsop/87342734227.pdfIn PDF document text
    • http://elitk.ru/_files/36767071586.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f941d1caf08849e0c981ac3a757d6c7a/zegazikuzurezatiwolepi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ac7qtpahun9v4hq9kbmu2g38rf/33938836064.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/96501442237.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/vazisaxomagefujovizozeg.pdfIn PDF document text
    • http://netflor.pl/upload/File/32636051536.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/8135533366.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/24051163489.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1611af5c5f3383---pusamaf.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/914921d53f3f81847cf15c605010d0a0/gakuxi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/449ffccc3c2c1f8cd09ffb5d4a92806b/savabogozejupifezep.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/52820416644.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161262230c8818---40215895659.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8300664471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fujitsu+fi-6130+manual+downloadPDF 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_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 11124 bytes
SHA-256: 459aa8c0d77e0a686c0fcb6892d318eb69f842cb4f17f9834bb769c3890aa666
font_01_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 19488 bytes
SHA-256: 94611ce20ba89bb8867b1d5d15002c531c8f34ab52d6e5bb7770d37a3ceaf27c
font_02_sfnt_off00014fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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