Malicious PDF — malware analysis report

Static analysis result for SHA-256 baeb55e96296b0db…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 01:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2ab29206222237acb5d5f99b0274df3 SHA-1: e3d04c7419fd42ce98fdf88e8fb40a415257c47c SHA-256: baeb55e96296b0db913d30e992d62758048f0613b2d1c0e41c64d7ce0d81b80a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to obscure the final malicious destination. ClamAV and ML classifiers strongly indicate maliciousness, with the primary attack pattern being the use of these links to lure users to potentially harmful sites. The presence of a Google feedproxy URL suggests an attempt to disguise or leverage legitimate services for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://srtprogetti.eu/userfiles/files/66295689028.pdf In PDF document text
    • http://iltorg.ru/upload/file/90831259461.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c97c30a2---gudutarakodot.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4eadb6c3---vuxiwesurizetibup.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/18105325155.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/fiduro.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4u8ep8dof225r6658n7s89p9ti/radakerolazizovud.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/mexulusiwolukijevi.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/23169392554.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/fb71a7c181e4beff9a2e4e8186acf8ab/2082139880.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6991387b267db20cf6aa93aec9af5aa8/dutiwafetuserumidapibivim.pdfIn PDF document text
    • http://tulga.ru/editor/files/kapemobe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c3226e8a4b7ce84be1ec3625db0d3cc8/20260799670.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/62181212496.pdfIn PDF document text
    • http://nenorm.com/files/files/figutuzisiloxidobuk.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/41730012011.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e2ef623a572cb7a96b037a3627832d5c/43866139223.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a48bc368---76836956310.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/72938090007.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/ruwidufuniba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+a70+user+manual+pdfPDF link annotation
    • 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_off0000c24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16856 bytes
SHA-256: 033305e4e5a13b47f079b574c90a432b7c98c02b831fe4511d68c0f34760d148
font_02_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 11092 bytes
SHA-256: d1685df939bf9f3056eafe8da78fa5a156215ae6d0dfe554c58e500c810967c7