Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a836e89f099b4d4…

MALICIOUS

PDF

89.6 KB Created: 2021-08-12 17:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c269fd05d47af74244f62ec0e8fb49d SHA-1: 5883d0c976733ad1f6c32487f8ffc3be2f9fdc3f SHA-256: 8a836e89f099b4d404830225bd955949630e755cec7d4c5fad066704e58d4079
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=download+wcc3+mod+apk+latest+version PDF link annotation
    • http://markone-tools.com/upload/files/xejogexer.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/26429993789.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e6e475996719bfdc696cb492d71b857d/11665793616.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abacf01207---vidumukevojajutaresoru.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/8d768274tisodrksnlo7kkrvvn/kagajibasula.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/28528627754.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1kg1dcit82rhm3erhu7caro1bc/bokadixosodudajiza.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ildbc45gk0ffm7s0ra5f5nir62/91265997801.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/75109633047.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210802144125.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zarizatemuxoguzepafu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5a4d0f1eb4fd5e5e9d12163439794e3d/89740867777.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609264855afe6---29763496247.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b1414b3341a25f12b1f08e85afbadd12/kolokaxive.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210517/210517182004883490j36jkjfk70o4.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/rasekedibetewuroseb.pdfIn PDF document text
    • http://simonide.org/userfiles/file/33268122504.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/guvosebugixonuwefinobujex.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830946c581a---namejuxura.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7015c4cf6419ffe4e65faf17f7582af8/70019668006.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/bidivamalosow.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/jogor.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/1c5405353bd4de4c2c04e07dbb3c6ab8/21884395399.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_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 11092 bytes
SHA-256: 1373c0a2c3dbdc049a4544621778e9bbb928afeb408ed47908635f6187e578ac
font_02_sfnt_off00012b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 17284 bytes
SHA-256: a33c7482b7806c9cfa6b3d9dfc28faa7b2a8d86b4b1d0a5035a7812cc8103c27