Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c19e5c4985194f8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 14:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db7f49496a7e5418d225777763c60c93 SHA-1: 563677f83e71e41d7c12ad9fa359edde66c3b064 SHA-256: 1c19e5c4985194f86d1864b36ed6925a4bb6b2d9663c7a8525a80fd427893a57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://drafthe.ru/uplcv?utm_term=save+safari+page+as+pdf PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded8364527---76348730706.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5c264b64f8da5ca8fd6687a812bb9bd6/8847900596.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zusatup.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/97158672843.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kenepefepaz.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/72265188124.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/22605348744.pdfIn PDF document text
    • http://elitk.ru/_files/72424069500.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/wanidaraxi.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/zepulud.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcca20f0de---5501962113.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/vusare.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/weporubo.pdfIn PDF document text
    • https://sinarwaja.com/account/files/vifojeniwopamukuguzitafer.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/59775969161.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/88852824881.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/52344786397.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///35645776442.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/lojepalupob.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/21205990681.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/55762643948.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a778e1f1ca---12379065050.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/razexefukilakumur.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109161326438068.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/94030733379.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/71556213801.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/tosuzolusun.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/35270228905.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_off0000b362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 10444 bytes
SHA-256: f6918abe37282a363e06e8c86df8a643cfabc37b15633d8ca1164f6aafa92bdc
font_01_sfnt_off0000caf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 15004 bytes
SHA-256: 677e908760101af8fb0cec11a6554590d92820f1cc8821b1c5da055e2c51e03a

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