Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d2ed35e54ce83e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-22 20:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f41d528ca7498930f33a126f3aab91cf SHA-1: 08d52634d1d1d08868eb21603dcdb9bcd8b414d1 SHA-256: 99d2ed35e54ce83e4f432412e11fee5d2c807aa70048a883c77bfea290913f0c
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://nomylo.ru/uplcv?utm_term=krrish+1+full+movie+in+tamil+dubbed+free+download PDF link annotation
    • http://eggtesting.com/admin/uploads/file/pimonanabusur.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/72648210145.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zebakinuzagixapegegit.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/voxafogutanupatinekid.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/30f5b8dd4c9c00445ce3550f623e3f5a/jibozogopegolodadesada.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/20879944598.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/diwowuxelofukefejodopep.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/32268302893.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/19143456849.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/tixomixabipi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/54717424336.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xifixa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16142712d60bd1---kotesaxewizelujekesibunad.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/45985089568.pdfIn PDF document text
    • https://somogyplusz.hu/files/raxadovenemesujowowovunex.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/67444927120.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/64757666232.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/faxizoredeliwuzuviva.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/52949061707.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c730a13e10587207ce63e89796a6815b/xuvovimixoboji.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/3050232255.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nawikow.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/pajojij.pdfIn PDF document text
    • http://linker-apps.com/files/90689606492.pdfIn PDF document text
    • http://wirheiraten.de/images/file/xigujo.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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 17256 bytes
SHA-256: c1607fbb327c82944b5ecb41af566a12ffee0c40fdf58ec1c4c1b2d6506aec2c
font_01_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 11052 bytes
SHA-256: 0a6f0b5964231e4a29f4a72a7ad1238a8f3217e96a003a94d89f78b32721f865
font_02_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1