Malicious PDF — malware analysis report

Static analysis result for SHA-256 d018ffe69553225f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 09:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a1c88f90ed12da463f5b8bc20bc504e SHA-1: d3ae10688d55db67c88a5bdca45708636038a77b SHA-256: d018ffe69553225f067eb408db6dbbc7f7bbb594b6663edd81f6195b9b18bc63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to exploit search engine optimization or leverage compromised infrastructure. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=um+voo+encantado+em+noite+de+natal+assistir+online PDF link annotation
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307958c29a7---64163515315.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6ba8c27ecc05ac27a4068aab8fbb6456/85301539452.pdfIn PDF document text
    • http://pileki.com/imgup/file/meruvedinidivepuvifapiv.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/3748118334.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/66125056096.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/womunabojukop.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bipumovokesozud.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/nigedomalusir.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1dee9dcd6f172d6cc4891bfd2de70ac9/vemikuvezivaxiwukojefiw.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8d22aee9c1f844b53b0e819b28644704/46752398549.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/86786116323.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/rh9f7isu103k00r0oeb9gk1tm4/59799759302.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/ranazefakedasa.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/kupezipanuzigazu.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/xadimari.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15682514731.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/3839426401.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/kozatadumalajokizakabu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b65fd6147---giwedakekalonelerelufara.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/91336511848.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/65620759314.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/11565994209.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/rexosivinasi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090516035888.pdfIn PDF document text
    • 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10604 bytes
SHA-256: 2a684abc1b2f05c9ed9c8705990b4df0bf8290f5bf6911548b90444361f0d1c2
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 21236 bytes
SHA-256: b6fed0d5994b24aeb24792bb15cc5a6b3fb95c947d84f30b4ee1f47a4fa5033e

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