Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0b1289f4b7905c…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 13:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c522b93fa57c35ac5fe9ea1f7b154687 SHA-1: 8e5ac1995aa8aba005559484da37c7088ad7b347 SHA-256: ba0b1289f4b7905c75c87cf4578bbbd7e556558683bfaea9d7bccbb20690bb99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable or compromised domains, designed to redirect users to other sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://berallebags.com/UploadFiles/FCKeditor/20210510100513.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/27923113921.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/appi4bsup0bnvcblmvhjdsa7r6/55172534718.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/88410563961.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nepireropulal.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/13860245927.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/gumomakasabuxisunalimerob.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/rotunisebubaled.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/13772bc3a8739b842dc5de4e3909b38d/84459413102.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/de394c3a4b213a7350a071ca38db1f55/48381197251.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cf54ea79---pulokulupimuxagojowawe.pdfIn PDF document text
    • https://schmitz.cz/res/file/mawibuwa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ca9f2fe3246fd59e22489430ad2fff17/lonopisaguloxetisojul.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/buwanudofe.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f65c57f0494545afdedd974ce41c172c/gefiz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e88332761---witogadiwarudusigakanopi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8452fd93---karotaxata.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bdc871778---50905883846.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h9emv9o8qrpeiuanjp2uo8d9fj/36279259346.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e64poiqmrv0p4pper86ftma30d/65665096394.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/popiramowiwibizo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8c855c62b25f1d24342d650571b22767/dugexuxuzomuzurukolipa.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mojave.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nutjc86k3n72g9h0b50q7k7l00/wemelatokopeduluvo.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/sexedefipaxer.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65ccb870c---55528529817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=play+music+groupPDF 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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 19460 bytes
SHA-256: 21aee8574eef30f1730ff948bcfa6bfacd3c92ee248d3517c611105d04ef26cf
font_01_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 10596 bytes
SHA-256: 7dcbb256014a9de6eb33bf35d3cba5a5a9ca656522b5183c3cae83b945dd7527
font_02_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1