Malicious PDF — malware analysis report

Static analysis result for SHA-256 954d39dc595597cb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 09:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3a2aa216d646b2eb065dee2a73ee5e34 SHA-1: 2fe29b6e67c41ce85dc049f7ca21bfbc7459dc7c SHA-256: 954d39dc595597cb7c30fb7bc9ac815f1bc1f7f39cb3609351c8fab69f0ef256
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document displays a fake CAPTCHA, a common lure to trick users into executing malicious content or providing credentials. The presence of numerous links to external PDF files, many hosted on compromised or disposable domains, suggests a link farm designed to distribute further payloads or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://afmiletisim.com/resimler/files/62296433807.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390d9c5b5b8---28940147034.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/61085485196.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/71928935170.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/fapatefugejaluku.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/kazawonumopevigipibivira.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/31605841982.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/2055153234.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/9278036330.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/mebojesezibesesojefe.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/netusasiz.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5a94b0da87fd769218590a9680c658df/rowutabavog.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/xodesukexoni.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/77131702442.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/50052607582.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/zagijekemum.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/fogag.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sexujonazexa.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134462948c93---49016288397.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/jalawerovunuti.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/wifikabisonu.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/verosabajajavekago.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/68622158950.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/detixamugenadevuwunojuvur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=injector+diamond+ml+2020PDF 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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 10684 bytes
SHA-256: a20ba2f4f8674d2556f987a654068c2e110fb006b5f1a9bf6b15d0f4e1204f04
font_01_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 17924 bytes
SHA-256: c438f1dc97a4b79555724abbd3dc9b07cce896fcb5e1a79163475bc0b771dcb7
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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