Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75a51f407d70b17…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 12:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fffef6f1800c2e64854f4b0cc36e58f5 SHA-1: d51409a1be1f73b750be25e79fb4c5aa1c2ed4eb SHA-256: b75a51f407d70b1785c1e1bea20879b8021e662e50377cad868e0b941bfae2e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://alkalacarservice.com/public_html/userfiles/file/vilireteteboba.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ot922k9628v66cpk81ct8qoc4/25327480368.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/gabidupuxebegase.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210904_F179188EED408A38.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/467197ca092341c9b220e1d7fc7659bd/tegatavodamop.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/tezudurisesipu.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/82045287860.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5e38a3547a2a053c184047b0acd97a88/digatosalewenewupab.pdfIn PDF document text
    • http://evola.it/userfiles/files/tunexuteberexozadonatet.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/75758015339.pdfIn PDF document text
    • https://la-klamm.org/Files/files/15873603455.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2bdda2d5522310097e997ad4f148a271/61682318600.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/vapipan.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4a222b159bf93dff5ab74ddfc950f309/zeraguf.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/42358205185.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9f1f5e527---80275340188.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/26552507692.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/magumekenugoxigumavokod.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/nasimurujegenezuponof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=firestick+tricks+mobdroPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 10428 bytes
SHA-256: 1b891afdd2f146ca2c816e74e7a7cba37cdb3e9257c611fa2261e2c8bd7f05fd
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 17740 bytes
SHA-256: 446c1e9c72e1288c370b42203418a24ff269dd41ec7a6274710472157929ce27
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1