Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c118af2e5ac83a6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 05:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7af47d83d894909b9f0b32ebed10b3e7 SHA-1: d4cc34241d7e07dbc3a48eb470202e5294dda5f3 SHA-256: 0c118af2e5ac83a64c5d435d0565fcaf0484d845d9c2354c1bb80a4573a9dbcd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1263c3da1---79640857483.pdf In PDF document text
    • https://cafemocion.com/userfiles/file/rerunibuzan.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/migabuwebujofured.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411454c62c7---tisonaze.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/90771523406.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/10169237388.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/24039474603.pdfIn PDF document text
    • https://limsurempat.com/contents/files/wudowelategodifodu.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/juguvajufizunodaloj.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304d11e4d24---danonevigaxowefupa.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wajavexonifewi.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/xelogerafujevuwexesak.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/nofesuxalilakaxux.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/zuzusimuzemit.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/tagopemaluno.pdfIn PDF document text
    • http://evola.it/userfiles/files/99524366792.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/6862233254.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/15587390707.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/26747653404.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/42041984898.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/38050950630.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315063b9c26---82104564970.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/57703241768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+email+einrichtenPDF 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 21300 bytes
SHA-256: a3c4fa390ed5d2b55b2f12988911b1c00375f5751849b678d629cf8abc8be7f7
font_01_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 10448 bytes
SHA-256: 306e77d7920f80a7623d8341764312d5877b4619cb0dfab3e073b193c5ea00a2
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1