Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5b8efdb4503e13…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 07:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fe5413a98320be34580238492e673f6 SHA-1: 31bbafa5434afac68dab8be338e22ff39c935b3a SHA-256: 8a5b8efdb4503e13b18005f8758b2957455674a57bc6e7138492e0c39ceaa3b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of linking to potentially malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bom1b32d815lomddgmsclv659q/sagepuzok.pdf In PDF document text
    • http://daehwa.info/uploaded/file/4982180842.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5lam00393o72jq7ecqi81310l5/sefinonofizisazisimumo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ebec40ad---60019112947.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bokazamufabepemokibubeta.pdfIn PDF document text
    • http://cityfate.com/files/files/17560401690.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/74513223204.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/kasabumotuf.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/buweba.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca6cffa6e37fe13aa1480ff89b1f7b48/14793289456.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70d1edfcb---78483574430.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ddec8b7fe---76758434132.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kiwiv.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/40766972797.pdfIn PDF document text
    • http://retrofotr.cz/files/file/82017977109.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/88136506257.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757dae3eab2---jiriguxa.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/10200557824.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ff9c80.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b613d3d6b---faravixoma.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/gilusovufunudeduworul.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/98951459801.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/fonija.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf5595b6a---silakujifiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plant+based+cookbook+pdfPDF 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_off0000bb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB61 16496 bytes
SHA-256: 580bfafe9a8e4648bf134c1b92f9e6e134f35b487fe8d5c5820d240b4eb421a3
font_01_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 10656 bytes
SHA-256: 517d40aef19600369521cd2a41bb7da476febc4ca9899f6dadc848b18647c7eb
font_02_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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