Malicious PDF — malware analysis report

Static analysis result for SHA-256 3445786681cd7e52…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e32d518abadb3ba643e7ba21f157c14d SHA-1: 9143b91b9a3c24225b6036e106beabf0b9d78431 SHA-256: 3445786681cd7e52efb3f22ccc79e4394ec2d967f97408e4f9dbf3518ef99669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a link farm strategy on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=use+of+do+and+does+in+simple+present+tense PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084809f6191e---kuwamutimumari.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/femojubokiwi.pdfIn PDF document text
    • https://edarky.net/data/file/sitovolovupugup.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/ritixenigekinexivufexow.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/tamivujiwatikanegakiji.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075c7b7cf1---megidok.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/posakibugitutininime.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/gebibatelumatigox.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/36533651469.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/neresiwutugabuv.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/a89kr88oimi4reem3k4q6m9t4p/5035970979.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084abd16532b---65740240387.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/67719540597.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/jowutuvajax.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1h1ri22rndhdmn42tr0a65fpqd/lezuv.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acad2bac1b3---xifigonim.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/telipabufamuvaxifuxinero.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781e20904ad---totozozuwetoxugug.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/onukl7e4v1qnul0m926ojtae8p/63063626117.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/qhtu43t9douimloe77qll1sp60/24064132543.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/21652273699.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/28423630729.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160fb05124d332---56914332684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609053e914c53---57745721932.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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 10668 bytes
SHA-256: bc3f0847ca0ecf6175b3ea18657d500376413000859b3339751fc93182cc7415
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 18076 bytes
SHA-256: 8f8fbc902e2720f5424ce3034e9095729eb3b4e3916fc661426a64c34ca5a30d

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