Malicious PDF — malware analysis report

Static analysis result for SHA-256 b200c2068bb5f7c2…

MALICIOUS

PDF

69.8 KB Created: 2021-09-03 06:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 56286f6f13f68a07fbe4589a7f80a64f SHA-1: 43a952d97adf2bdc1560f2a4fa85d4db3e2e7ff5 SHA-256: b200c2068bb5f7c2ed57eef78c0eaaca48c4245b0cb36e08ac20a8d674067dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host and distribute links to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=order+of+rotational+symmetry+worksheet+pdf PDF link annotation
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5laiad3pg03ls98phuigi9vtu0/napusoredokijekomudi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/82132070688.pdfIn PDF document text
    • https://ubranni.com/uploader/files/88103559743.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a4vd2oc6sqa4a0lkre54566uq2/1918082984.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/bipuz.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/01698vm0tjntob02608i6mn830/lanurufivob.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106f33acff6e---jikuvubererimituzilinik.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/98482772352.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/zasozasafalugitefefasoduw.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/43836560313.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bafivajiva.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/32429111108.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-25/20210825153510191807.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/jibazipaxovolavotod.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077777b3146e---tolup.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/60674434323.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c48198e2c23---zokikurozuranitowagevoxo.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/zokozofaburad.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/resoteku.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/66442197948.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fde6a120a---92954301091.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210727151931.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/bisosapixepedunagoguko.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/rukabof.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_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 15068 bytes
SHA-256: 6456ad0a623ef3b439b656ed41b173d5d3eda3f358e06d0cf1fcbb02a041cee5
font_02_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 11080 bytes
SHA-256: 5ae2a9795d415bdbb91b49eeaebdf30c1b447fb5e77398f0e7357e8075bcdf68