Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ef2689f3dbad4c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 05:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4d7498779e628045d0e493eea3ca0a7 SHA-1: 4c93b053c176303086bd8728f62a690ed8d36496 SHA-256: c3ef2689f3dbad4c14f2508082e7db26620004517de538b605ab46a689752d1e
196 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, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials. No scripts were extracted, but the heuristic firings point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c030fcf124---19486901564.pdf
    • https://pestresolution.pt/site/upload/file/7804167508.pdf
    • http://bydnjl.com/userfiles/files/bafawefufobebetel.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/87a6318b8968fbdaab7ff90fc12808d3/30071964603.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077422860e2b---vinewabakuvidarozazuwigim.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/15f325adbda1088b93f5ec2b35bc8f0b/tunenobobobitejosemeleg.pdf
    • https://keyseries.us/userfiles/file/2748971976.pdf
    • https://bookatowncar.com/userfiles/file/21140055303.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3dc750a7e210b14d99947e5f8cebfd1c/80394011368.pdf
    • http://aftckwt.com/uploads/file/fivubu.pdf
    • http://studioschicchi.eu/userfiles/files/4186391588.pdf
    • https://wodepcb.cn/uploadfiles/files/sodozujefivojuvavaz.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/vemoxuziviminekotufopoguw.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50aa6b851---labawezevigusiwal.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/22462999874.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4dd1b79a---tuguxoxame.pdf
    • https://soudurelausiere.ca/upload/editor/file/suxizusuguw.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607044fc45bc6---78187914960.pdf
    • http://ekhoron21.mn/uploads/files/53773633203.pdf
    • http://ahzycw.com/upload_fck/file/2021-8-23/20210823193238439920.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pltpl05vgkmrlotign788jp2mc/85198746186.pdf
    • http://altinay-law.com/images/file/nikaguremomef.pdf
    • https://mudraconsultancy.com/uploads/files/nebeserinatererelubef.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/91373570452.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sfbt+miracle+question
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ce.bin
341f297a1afc78a86408643f97091d86ebe354052bdcb71970dd2315c8c2c44c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 10960 bytes
font_01_sfnt_off0000f330.bin
b6c6f970d9339d18a10bb42bf66480997cee027ff9b508148db82dadcb43b4c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 18264 bytes
font_02_sfnt_off0001229a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 16792 bytes