Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97c35b4f88c78b9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-30 22:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d3fecbe4e21cea5d6667bb4699961ce SHA-1: 8d2845c09b71c538d3d00694bd75c92688bb2cd1 SHA-256: a97c35b4f88c78b93802b697704d66e56f715a164cefa4696a52bda3b0389399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on compromised WordPress sites and disposable domains, masquerading as a download for 'The Witcher books PDF'. The presence of multiple unknown URLs and the ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eb393816b872c739e06cf937502bee23/vawogijegusobekofev.pdf In PDF document text
    • http://3xlove.com/uploadfile/file/2335190916.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/nibulozepawabax.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132395d62a9a---jasuzeriro.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/35695977186.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/25831500163.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/87679840875.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/302e4956759364c01178a49e3a1c7ea6/xinew.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b504eaea5f---12028171622.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/77170884983.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/tevopizuzirubetovo.pdfIn PDF document text
    • http://contelex.it/userfiles/files/25340872742.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/ketitezolita.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/40574850323.pdfIn PDF document text
    • http://xycrusher.com/d/files/nuroxefox.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109251312139266.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82fbacbc---23673591164.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sodozipape.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/vesaxun.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/pumazosubelokof.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/7499322988.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/25990919108.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/82711435795.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021092508285773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+the+witcher+books+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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 18572 bytes
SHA-256: a292df4dc52365d6eeb0d4ca4e7f33918ef5cda0b6d3473a41b473e6439bbe59
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 11036 bytes
SHA-256: e10bfee43b0951bc531073fc9f3455e88efa366951c6ca09aafa7cfb3602274c
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1