Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6b6f3786a6273f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 12:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32d102f053d5fa10eb3d4bb8aca48507 SHA-1: 0c4b359d5e1130d325743a5ebbf9a0886ce047a5 SHA-256: fa6b6f3786a6273f2de9191d93fb54b6d5af4ce306e3f6c9c33387433564e3ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or distributing further payloads. The PDF structure and embedded links align with common tactics for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=audio+vision+video+maker+apk+free+download PDF link annotation
    • http://hoteldarim.ir/basefile/hoteldarimir/files/22894673759.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/62748658802.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/45902496078.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b2bf4d61f9a47ef258f6860b35c58822/kaxojalod.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cbffd7e0f65fec597c4d1fbe8bef8680/botelo.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/volonebuzevesa.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/8218919642.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/88377151954.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/mowadise.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wejogivixexa.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/tatevasonapisodewi.pdfIn PDF document text
    • https://qnzar.com/files/91823801450.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/gexojufavonibew.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/20926803779.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/butiguzugakokitofuso.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/rutiximobu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64ca7da52---wesasazogelosabak.pdfIn PDF document text
    • http://canadianrockies.info/files/file/luweninil.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/34421370845.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/8558945734.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/xonilezedofamemepo.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/tajubibije.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/rosisa.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_095156.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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10884 bytes
SHA-256: 746713b9e75dc5defac13a26f3c864f389f14c0718d4691b59b5a3c073a5de86
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 17920 bytes
SHA-256: 8602be5ae701aa1f67187fa54724af2570c614023b6dad05e3d207684117c156