Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a67d4661841141…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 11:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b69bf3d439c01d9ff390f4c33c46a433 SHA-1: 1eba0d3246355e12a69680d6602fdac5ce630b9b SHA-256: 53a67d46618411414e8cc3784b0e258e93142c19ea033bcc758fb4d3ac1964b3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious or phishing content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/74704be2bccde06e05400f7bb935f9e7/rinagalamimiwufixeb.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901f0624de4---vunil.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb21184b4---40763970584.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ff3010622409499e3ffdc9ac07404bdd/xexexaliwenozonaxidis.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0fh8hcj27oq9f0knc127ii5r84/xumejifamamenejolixulo.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627277249_e3aa4de12d.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6b68882---34757818140.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5174f66cbe2c99c62632df69c91686ca/dabixumuti.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9f692dcd---48797444669.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c5d836erm58u7dfbmifno9laa4/pipej.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/53960425220.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb29d9cd30---kigavumajixoxodagokini.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/nitojonusax.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9e10572f---zubujagupifunexowanige.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5cfdbfd1---60857821072.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bffc63ed---perebexomekalujaz.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/niputabitabebumomisikibu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4e677a1800acdd755738f0e8919715cd/vesepunapipaj.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/70935707098.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/guzutorovoginegeni.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/47500587692.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b4a92686f42c3786ba48eab280e7b477/duboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=security+design+principles+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_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 10800 bytes
SHA-256: 0582975a7fed1832da18ad26287fb88a01562d51dca24225a05e07a7b9185439
font_02_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 16392 bytes
SHA-256: f3c57c21119209e38a92b1f5a017928ca21d03729f11a1a1a8ac25c1cdbaaa6f

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