Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d36685ab4785789…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 18:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bc2b2d1f818762f3c57f4ae7486fe25 SHA-1: 86c3428ddda169c3c0561fe37a7616dbcb5f4039 SHA-256: 6d36685ab478578939747c2b3bf3d0387bdd2073adf39c203d8fdb511d83e169
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are algorithmically generated and point to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bb1cc36a---5051311211.pdf In PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/bikudusugagemiv.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea3094f986---72945442674.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/zoboxagujijufuzudimixut.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/75717961533.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/nitufenewedenet.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/80412132328.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/98908427510.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/56170872013.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/2378773539.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/guzivivovowuvako.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4ekgdq5lt20pkcceqlmrf5gtd7/kevove.pdfIn PDF document text
    • https://isleo.com/i_photos/file/58444546562.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lolejuzunafulilopujumujam.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/14950886127.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/65106900696.pdfIn PDF document text
    • https://rotitelor.com/contents/files/55633013569.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/rokofogexidezolulewe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3cut9ph5elmsmkdsg90vhndqcq/94667300865.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/71102454863.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/xevulivuxonofixino.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/zimov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=play+shop+android+free+downloadPDF 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_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 10696 bytes
SHA-256: 9b8699471f790a38d0e90539a5a79514326127f984b687e420a3ed1da5957989
font_02_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 16928 bytes
SHA-256: 77ca23a781326fb9d5136e9428a20f8a5e7f95aead03cf8be4300eb376b273c3

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