Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5758a589979b7f3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 04:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d107ddcdbaec2d693ee820c3b1fb821c SHA-1: e721ca5d197af42574e26a23439338018266c9de SHA-256: a5758a589979b7f3cf70acc5b9e61716120342981f33df7a963534e2aa1a97d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://inwebjor.ru/uplcv?utm_term=zombie+hunter+cheats+for+android PDF link annotation
    • http://m-camper.ru/ckfinder/userfiles/files/dajivilonunisenorikarodu.pdfIn PDF document text
    • http://odumakus.com/uploads/files/66561195656.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ddf51aafd083c70ccbfa9e22686262d0/99485616095.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/74956474486.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/25222400008.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/6014764316.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/bumasawunijuxiv.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/kilaribinorupinewuve.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/67218737475.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/63402941562.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cfa2bf36---20570338633.pdfIn PDF document text
    • https://bfull.ru/uploads/files/65013084757.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/30156165911.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/70449960230.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/dixekona.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6fae049c626c8e7fda0f9b9d65ba93cf/silugidagodekuvub.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_041604.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/69992541256.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/13kd95q8ut9lmr0j2vhn1ng285/57743234338.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/nelag.pdfIn PDF document text
    • http://alkanboya.com/files/file///24170079989.pdfIn PDF document text
    • https://bliznacite.com/files/pofid.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/fodevoxotinajako.pdfIn PDF document text
    • http://contua.org/userfiles/file/juxadawuxexuperizaj.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lqr14usv6qhkoc54mkrp5dqc3o/31513236780.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pubati.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_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 17124 bytes
SHA-256: 0ae127928fb5641b6d5800a476c2febfd3517e64acc4a80d59e124c4e10a265e
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 10900 bytes
SHA-256: f99b9531d2102a693c075725e9ca7ac35cc7c206ff54974bf1ed8929e0eed270

Open this report in the interactive analyzer, or submit your own file for analysis.