Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf63db138b79a39f…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 01:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d51410e86952cbe0811c92756198b52b SHA-1: c2eea847adc606a8158b914002eb0cee242b0eb3 SHA-256: bf63db138b79a39f234be95d755642ac37833d1b6ed082a3add566bf39277d38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the link farm structure are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=exampro+electricity+test+answers PDF link annotation
    • http://adaviestransportltd.com/userfiles/file/lunadobi.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/67177085340.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/23613094901.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb27c791e---57754921734.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/21e437f86957d00b5df54d17f57ad8bb/sixopupux.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/99679845543.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/lujiluxuviremefimemutij.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c3a16d7851dfd0103a26460218145d92/bataro.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/komarupuliva.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a46374249---74894037335.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/xipagirelodogu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec19d0899216850a0001d8595ce5bc44/fuvopuvevegagesubafuf.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/89881506820.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2o86ht7v8fb0p90r6qo61qfqa4/95976233280.pdfIn PDF document text
    • http://rentaruedas.com/files/others/21145552333.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/15497735705.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3755780d27---88189704227.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f8af18a5---sodupusajixuwaxo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/30216508159.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a19783c0ebd8336bdf2a7c9ff7863d3b/22234456878.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad160629be4---37641957782.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/141192c4d5ca21f745306498b44d679d/xosuruzurivopumumupumo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/6012707866.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp9f35e10f81v7jukugte5ohhi/70594383724.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dunilawofigafamarabejofos.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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10820 bytes
SHA-256: 4b7552cb8aff25c5fa7b37a8f7f6676c612337cab7dd42e65387e1c1ae1f98ed
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 17008 bytes
SHA-256: 741d820f69faba0afdb5af0a20ce8a5a64f959eac5aa6732970a178dc9a72aa2
font_02_sfnt_off00013240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1