Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a7cb8a517ae65a…

MALICIOUS

PDF

84.3 KB Created: 2021-08-10 22:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8be95b1d4b665023d0eb1a92260370f SHA-1: 1bccf16dd4be9342168b907174a83b79deaecd82 SHA-256: 09a7cb8a517ae65a677f6734bc5b5b2ffa9bae5514e83a22dab09395315e6345
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities, suggesting an attempt to distribute malware. The presence of a "download button" heuristic further supports the interpretation that the document is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://drafthe.ru/uplcv?utm_term=dt466+flywheel+bolt+torque+specs PDF link annotation
    • http://gustosandvic.com/ckfinder/userfiles/files/nopijeladonukudutoboxopiv.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48566a16c---vadoluzalaturisovutago.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/84226272900.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607617a145775---60574923302.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ad186f54df04438fb5542935372e7688/fipiroguvogijamam.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wumedibiriduduxapi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16110aa0ae5db4---gexebumopus.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/towemolofujedafoxiriw.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bovadufajobiroferup.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xulogutivo.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/dalawi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bfe19a1ad2b1aee7c66940f7187867db/gofikijodogepiwiwijoxavax.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/79869948949.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dd0d97eb---vezezateluposezemeka.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f502475df---napafoxuwaturasigogona.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/62884764552.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefebd4079---93768208840.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/sitonizevir.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/29505214308.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/49357e2ebaeee50feed1370646ffa4bd/86649095782.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3644fd6843---23324770234.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/xurerudiwem.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/94714129342.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1nlhc9dg7hqe8jv55cqrsnc2q0/mitupusalibe.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5acb079293136ac37c2f77505fafaced/75025043062.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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 11052 bytes
SHA-256: cc949dafb6b581433f4870925147fbf89ba4c3553f962e53f00df6555f2bb4a6
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 17136 bytes
SHA-256: 81eec1e5f40150ee584d59a9a68b7b399d4579c534e0935a31ebea8b04fecaa7