Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8938991ede5e51…

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 17:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1577353bac89d7513a91fcead0ffe878 SHA-1: 1f7bfe192305168e0ab0f206546a801fae48b28a SHA-256: 7d8938991ede5e5188ac991d0081a78b22c38faaa15b6d388258c123b3281c7c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du6el84q9rtlca1rn8mp7957b3/43260503868.pdf In PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fad52ee2c46b00e37c6af25d76256be/libulugeveredatu.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/juguredegoxekobanavojosas.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e32c2c8655---zeserejanuti.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc15b35f7---pazixotawaz.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/vgoipimpjespfift870usu8015/39248961118.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/169006642960f467ebcd786.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16cbea75fd1be9891502b633d90d38cb/97106543561.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/65063877629.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/dinon.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/25026468637.pdfIn PDF document text
    • http://freewest.at/32771865645.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4pft2uepr382o7crv8tjjrmns3/73851132415.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609153c491d97---fozivanitidavagawubapulil.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/misatexivatipojixek.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/karunowelujiditeroze.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vf5149m3kf1ff9mk5mjkmcqd8m/figadigipuxofub.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094404a29d94---17375058857.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/lemuke.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a77f29155d7e6212760fcc0c9f1b973f/jakoralulukivenetonemebof.pdfIn PDF document text
    • http://belean.pl/userfiles/file/beximowamipujuzus.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7f15c6e1---60026792410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=h%26s+mini+maxx+latest+updatePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/jupunuzigipefezaxiropinoj.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_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 9064 bytes
SHA-256: 591d9d01fa162a63dcf956bf9119e00b238dd1a96502d52d46b633f78bbee6c9
font_01_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 17496 bytes
SHA-256: 40e32924ce041bb4c2aee3629131b438d904473bd332408ed9dab8c9a03943d7
font_02_sfnt_off0001425c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1