Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbd63384a07fcdc…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 19:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 792833d046f7186b3196c258d870853c SHA-1: e4c256ccbc811b0625ff7afd5a429793a65e83b8 SHA-256: 8bbd63384a07fcdc9ec969c48a467639125819162292141b3f707d43c67669bc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=cashflow+quadrant+book+pdf+download PDF link annotation
    • http://bipaf.org/2009_home/upload/editor/file/11070941000.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/xarudew.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b201a8c5d---98218595302.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021991735587620.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/88150633821.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/pexadokam.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/denilitubufogilekupo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135658786922---bavasubifiw.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tadapibonudejefugebal.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/sozoxuvugegijovo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8d425b0af1694e638d3b8260269cfc15/83063599704.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64b59cfa0135cdb6341774bccaf4a004/buzigugimuxitajupozugama.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/20341254858.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/kavobiji.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/paxozusawararulug.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/lilebisosifoxaguwijuderu.pdfIn PDF document text
    • http://ux-school.ru/files/files/97302016241.pdfIn PDF document text
    • http://klenderbio.com/upload/files/77229944891.pdfIn PDF document text
    • http://101balkon.ru/upload/files/67907922305.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/gukusajowufis.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/61652047339.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/41292349367.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/17018460951.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/zagapir.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/nisofirerikewufimu.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_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 10964 bytes
SHA-256: 01071b6260f1aa254d1c401febc7fb685ca136119d31f89074b5cb3259d9f79a
font_01_sfnt_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 15832 bytes
SHA-256: 2f714705770acb58a99bf2ab65dfb26f28416fbc5c739095713072e08247273b

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