Malicious PDF — malware analysis report

Static analysis result for SHA-256 b691f65c06039aff…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 02:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 265edcc04ae7db075efe9b27f0ce92c2 SHA-1: d309ee52546cc0dda5b77c63d09e4f55e4c21648 SHA-256: b691f65c06039aff12805f47d11ffc5c95d03fde102b357a07a50e168300718f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content, potentially disguised as a salary slip. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e99a0b1e27a6991b4941ae52ff75d08d/rezapadezidexiziwewala.pdf In PDF document text
    • http://royalwedding.jp/images/blog//file/samumodaxofala.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d3dada7f6ae430bb390385ceb0253466/28446875175.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/van292vp3sob362bs2a4tjv3a5/88273509070.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/54517581651.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7858f5db0a---wimadut.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c90651b3cfb2513e394f2def220ae013/99645383899.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdabda7dfa---57126270034.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760bfa6f67d---nutekav.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f93370093c9248c333f4f4ae6ad0780e/4516747663.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/70036318976.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/55107854890.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/winunu.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/33961750256.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db82e4b8af6---7468810398.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xegobulikedijeto.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vomofunug.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/41384530411.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ed1ac164---japajugopigul.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e0a3pr0lbpsof9rtm45u85rvic/64724626313.pdfIn PDF document text
    • http://alltechsro.cz/files/xuzufiwitizire.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf26b7df5---95925848386.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c677059840---joxexoloketibusi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bb5a67ba554fb93ea98dcfbc9a59472/diverifixomopapumol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=salary+slip+format+in+htmlPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 10680 bytes
SHA-256: 433269fd90d75cb9a5d2a228874f3d237e22f39fef08b33cfa454b9529269839
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16976 bytes
SHA-256: b8c57ba878e927967a209b9775bb816a24f2f710e4fdc9fe4e654382a55e1fa1

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