Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ca7c62066eba33…

MALICIOUS

PDF

88.6 KB Created: 2021-08-02 05:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ddd85a6e575440a8806c5c43b430cd5 SHA-1: e57e3785823c02c056979d406aed19e8d9296e48 SHA-256: 16ca7c62066eba3307832eb021031935ef4c132fd9077d0144b909ada3a4d238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075766cc1573---95631119383.pdf In PDF document text
    • https://iveducentar.com/uploads/assets/file/55630814377.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/kevevusefekadad.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kulewipa.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/54520841752.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe9c8b81af---pebefoboxokebodisarewoku.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/79446013938.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c2050ccd---ratowibigakejomo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c948c1431da---giwovixasujutafupu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/9425916305.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g17ppt4hvj0rlhq9l1r0mlb9q0/74775420090.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eca6ddbd3---koladimimasowobaw.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/78597397971.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/zifosonofovazitinare.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079be97563bc---63347127997.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/sizibizawugiwazaju.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69362631427.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39d92130f---43284768626.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/nagumikiribusilava.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/59c84a14ae8ec4646f3d2f1631138844/dafimugitula.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/fukajukakitera.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/wasavez.pdfIn PDF document text
    • http://short-story.ru/upload/file/tabolufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tucker+carlson+today+new+showPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/xizeram.pdfIn PDF document text
    • 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_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 17288 bytes
SHA-256: b5d455de459a7a394da3ab56849463fde11eb35806d0361318f4b2a7f36c78e9
font_01_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B43 10732 bytes
SHA-256: b51213f2ccb21ee0d5a05557abae4479140555c85d6cc4f031d4326a57a4d2c3

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