Malicious PDF — malware analysis report

Static analysis result for SHA-256 9665c673317ac3ec…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 04:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6b9dec2d043f0d937843fcf544cdaf7 SHA-1: 3a9994b83529158082ee0707b84d81b93ff40983 SHA-256: 9665c673317ac3ec498ba69123f40d361264f7fb2fb9a1d46056ce09742c1edc
204 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further support the conclusion that this document is intended to trick users into downloading and opening a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=gta+sa+lite+multiplayer+android PDF link annotation
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/47169761943.pdfIn PDF document text
    • http://brenderup.ro/mm/file/18621830982.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/be27635aa3b018855f2f24f3b41b0d3b/17824105792.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/lipelosomut.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/25792766985.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/runizexagopufin.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/99807838915.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210906015028.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/69945757699.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/giwulaluboxabo.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/xilajegedomiko.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/97742632557.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/53069862811.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/4935934875.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/28147836172.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99bfedc3f---rilonumij.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/5227516321.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/94589923013.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/72189515715.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613011ef53b9d---modulazovogatejenemep.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/talufon.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/43513445500.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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10804 bytes
SHA-256: 5fd4735a2b6fb6fe2f2c2e199e844a82c0ce0c14d5c18d663e6e88af4bb00b54
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 19436 bytes
SHA-256: 38b64a49a68dc02b8a019273ed119e0ec77a5c7274133eb9a30f653cf1893890

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