Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff026679dd1eb0c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 07:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dd0c37b887cc314bcafc514817f03eb SHA-1: 0d1e0a57b10a13729d282ef1c1f38a3c1c472356 SHA-256: bff026679dd1eb0c99436ac2aa63936a133162db4cd4d8ed165d7d5e6e3a9d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=add+and+subtract+mixed+numbers+with+unlike+denominators+worksheets PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e0883e30---serapuvore.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7bf2628800164180aaf8cf03d7efac3e/77897644400.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/niganuwumeduzo.pdfIn PDF document text
    • https://rajakedua.com/contents/files/lufogazemufipisotu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/87345142742.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/22421318742.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/477587b6a28b07e0021608ed7f9350b5/nekokanidekixesezaluf.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210629074621.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d92a1a03---kofujigazikifenas.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/95735979369.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/naxebof.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/21209169325.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6e433393282048cda46b77a33699650d/ponifadijopabej.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/sadebugezulolujopudiwu.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/papuwinirarizomiruribet.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b81d205eb337ec6cec9fc4a8a4fb0b8/bumibadojoxa.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/kodit.pdfIn PDF document text
    • http://brlairport.com/images/file/tafuvibide.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/95953080918.pdfIn PDF document text
    • http://allasclub.com/campannas/file/juzeravosuberirazamox.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/61017451205.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 17752 bytes
SHA-256: c7cf008c59b26cf0d40b1d66e51a715a46673f620ac00433cf4a673aa5d4a2c0
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 11136 bytes
SHA-256: 88b3247c4029ea66c5856513bfee8b87cc4e4a6a1c8136fe6e8f141867500937

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