Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fa368c75394e15…

MALICIOUS

PDF

83.0 KB Created: 2021-08-23 12:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea12d07926effb220cf0e52751c7e2aa SHA-1: 481813e0e42c3ceb0acfb67eeaeaa2f730c90cb0 SHA-256: e9fa368c75394e1506d4dc45b8496f4bfac58be0df501e5210af61bf992525cd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or malicious domains. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://snap-drone.com/userfiles/file/wonolinolileterukajudava.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5831ebf29e---97588242981.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/45996881637.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0306a8d03c00c1ce070a48211151b66d/wonolemofodimu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609451e033ad6---pilas.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vugixofa.pdfIn PDF document text
    • http://flexa.cz/docs/file/10605945397.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/62583787960.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/wuremigaxala.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/25884349394.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/berazalutapeten.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea30029f55aa28e267b5f3b426615ae3/natinopabilej.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5jd8mnihsi88tbr4rhcs5qe7j3/42380863044.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mhdg0iir9e66lebrf34haltchv/xemoginapewenunebonajine.pdfIn PDF document text
    • http://change4best.ru/upload/file/mufavojovesegobuxil.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/sorijiruzisozukexopiwu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/19419049469.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/81264892979.pdfIn PDF document text
    • http://prograsifkalip.com/files/67208291739.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/eea0b9aceea1ff4f28095f64d56ac76f/40064672958.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/26c37f1843348cab7bf61acc1cd725d0/48392044914.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/17057459954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+unlock+an+android+if+you+forgot+the+passwordPDF 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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16560 bytes
SHA-256: c90490f2d053e93adaee50b7d044e3a960643afdcc93682ab90b5d986a473748
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 11284 bytes
SHA-256: fcc5535040ca7d7b350ff8706c24bbcea21ea53a2f879612d8fa9a1dc11b8b9e

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