Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6e8706b20ee9c9…

MALICIOUS

PDF

94.0 KB Created: 2021-07-26 07:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a43de5debbd7f9bd6e43cd50b4da890 SHA-1: 4b26f51fee9d0976e88fe699b101e3ea62759f9d SHA-256: 8e6e8706b20ee9c9841425567029d3dc377510e3914bcb9e158026871c85ca3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/38d5e4c5086e3743a547080a1347db67/sowisanonak.pdf In PDF document text
    • https://publicbridge.pl/userfiles/file/rajoboputafogidoxos.pdfIn PDF document text
    • http://freeski.hu/freeski/file/satibumeruvimebitumo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/287f43505b7d12e691fb1ba1d96ebe10/deposunepilanilenop.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/1563565439.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/35196546609e9c308b2b7.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/12398653663.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb2c9d56d---75043853762.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/70738598464.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xudojuvonilezozav.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2c59fc76bd7df48163c29207bb23af68/92080883510.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/184b8b310dbe9b99ba3968e6d0960cef/54709153566.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/eiab5al1bpoo17t3v62ufoppq4/82832203815.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160967b80ead6d---25691726029.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/24241002455.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wapotemawe.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9e9f240c---69071383640.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k5a9khocqf375odna6qbl4qgc3/42664159704.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/58357947105.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/miwanopitejoj.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25aaca55b---4064862629.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/nodifekutavumami.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/713vae2b9o8rj56j26f7rmc24l/73165223878.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9405d48bd1d053e4ec5aba1021bf1655/82825938443.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db8c5a8b40a---movodewena.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m7uj5bccl56qcff3il2sbsljn4/55709074645.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/38pactvralfl1ulgk8kc1mgqbj/xawavadufegawofexedisime.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e990a0db---zexut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bare+necessities+flute+sheet+musicPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 18372 bytes
SHA-256: 1b8f7c3bdf7d88de534c9e3f6fa563d414290c669b24f5aff25c501f018c39dd
font_02_sfnt_off00015019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15019 10636 bytes
SHA-256: 5726322bb967bde0eba0bccdfc27ed18795dee881fd8364e15f3d80a147faf49

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