Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf96f0e4cb3f97b…

MALICIOUS

PDF

140.1 KB Created: 2021-07-06 04:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f1bcf0811172785f2d4d71715277c81 SHA-1: 05d930fc63eef8037735228ec26707c430d0ec6d SHA-256: eaf96f0e4cb3f97bed844670b7473131f255010984d32c63f74ced3a87a63390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9497

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://cructi.ru/uplcv?utm_term=he+has+a+temper+meaning PDF link annotation
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a7879fa5---12038062917.pdfIn PDF document text
    • http://juentai.com/userfiles/files/38342057208.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3874f810ca31d2944880041e42732de5/wilizowifotok.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b755d60caa3---direbeka.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8ab0182---gudomofifa.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba85b26e59---41034638491.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa5bbd5a54---dolovepisetubisofu.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zupujomemunelemediti.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/s8qs197qrgsenq2dpfc0es2r7l/48736922494.pdfIn PDF document text
    • https://p87.hu/files/mujubema.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9bebac4d---65762133333.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1u3achd3nag86fla2g7u9ts0ik/98106093002.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/78dcbbd6005eaa54f10dc3ff627ac342/11300555413.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/85423505975.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/dadimeboresojabuvulaj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af7abed2830---75965981936.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/zozutumutaw.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1fe9ef02---xuwifepirivubupozexug.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/49591499872.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/59199228216.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/sokijopig.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160965b1a2a0b0---ligutizazote.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbf0380ba---kogutinazozutitemovot.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001e585.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E585 32524 bytes
SHA-256: 215ee4547f6197b5253323d6c279676bf985f0521bfe44df822f5dd4e0737299
font_00_sfnt_off0001436f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436F 34336 bytes
SHA-256: 9c203d7c297721b4825bdd40c4740686d86ee11299d7fe1171744a0963609a5c
font_01_sfnt_off000190d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8E3 11516 bytes
SHA-256: 1ccf9490a340ef557dffa878b43b3d87362d433e819dc002155cb745e03f4d5d
font_03_sfnt_off0001cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDD6 10524 bytes
SHA-256: 12349d35dd6d062d54c2257b646765525bc370a9eaec4c3388a4d939e0ff7d40

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