Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4589a13c995eb2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 15:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b49187b373bbd19ff938c6a05f37a4ac SHA-1: 8c30da541902a7476741e8e6d84e344b7c12d6a4 SHA-256: cd4589a13c995eb28c8cde3ce8cbd2b972548a99951d6617894ca8f149bc0db5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection confirming its malicious nature. The document's structure and embedded URLs suggest an attempt to redirect users to compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a strategy of directing users away from the initial document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://lngpetro.com/userfiles/file/gewasurikifavepatuzebenik.pdf In PDF document text
    • http://modero.vn/upload/files/zejifar.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/gadebi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/78869447c242b742d2d0f54e10c2f035/varafavogeta.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/kurol.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/51483576933.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/jijozeju.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/87e97ac0e2bbbb50df7cf0dea17067b7/ruwepipude.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/26873292573.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/pesoparulexagi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/us4a1mnbqid7runnr6ve6pasbl/pajufow.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/ludekifozenaf.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/96980485378.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e505a91---benejum.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9bd18939ef08a0332ab5b2dc879ae0d7/97599629077.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7176ec8c---sapazebabotamofumosak.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/45995597287.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109100504597757.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/41808308023.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/34561507607.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/48650639913.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/3341c359d56e821b0f0f9292d736214d/68839136071.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/74042972212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=samsung+galaxy+grand+duos+gt+i9082+usb+driver+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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 17904 bytes
SHA-256: 5bccb7ef6ff5db111107bc12962cf0371e4feb654e7b96257a3c7333dbe00baf
font_02_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 11892 bytes
SHA-256: 3a45ff907bf779c7e9c2c56d4e616148442577b1bb3626c81cd8ef96784b49ec

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