Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f76935650d4944b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 12:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0adce76d6054d6c9988af9442225f8e SHA-1: 6ed74d16e119bd9eb117e334dcee0be98d657e97 SHA-256: 2f76935650d4944b8e34c6b6438cd6d367d4f74ca2713ee885593032e2bca89e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=multiples+of+5+and+6
    • http://bscsaoner.in/ckfinder/userfiles/files/gibonesikuzapamole.pdf
    • http://gemculture.com/userfiles/file/xigebinapabemorugug.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pdkqqfb5potod0dp69ek9h9687/xovofajeguzoti.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a67722085b4---zonixenakejoxu.pdf
    • http://aimic.com/userfiles/file/nepevip.pdf
    • https://sbufficio.it/file/segodujuborojo.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba640c3826d---80067375270.pdf
    • http://skrabl.pl/www/rpbd/fck/file/repufiba.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/runipagipazolevodulitixar.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/14161696818.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f50dc941---10950138383.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2622e5c3---52420891311.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b89efa7e478---giwelisuludi.pdf
    • http://www.aqsclimited.com/EditorImages/file/15367636027.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gt0t6l1sv5emg06otb847r6iht/jedomudijodogodijiro.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/90330252223.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b5a77da---43351707899.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/62de2122022bc79b40d98085b7877e11/24638123043.pdf
    • http://bajcsidavidfoto.com/_user/file/wumopiw.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12ea92662---faxavajekikunizo.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4cb9dad93d6fac4a21877e6334cbcf55/83407886194.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/32962650511fdeb50c7ef9575d0c65da/42438703343.pdf
    • http://adria-ex.com/images/blog//file/mamotox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f265.bin
3af5dad2cfd8161ffb783ff952890567185894710f3ea09913f82be7727f5319
pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16336 bytes
font_01_sfnt_off00011cab.bin
a5690e16c299848ad62f31caf6ee2251f81dae8e74cdde2f4f3c21c485d320e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10784 bytes
font_02_sfnt_off000135b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B5 16792 bytes