Malicious PDF — malware analysis report

Static analysis result for SHA-256 76517d081535e7cc…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 18:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f7bf991d24c0af67a2034acb8ca7da4 SHA-1: a9208e7ba7779d2b2b92ec3f7a27d6d5a54fe3f9 SHA-256: 76517d081535e7cc69e7432bea4687211abb90e2cb9fc4a95b4369bbd0ddcc17
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=186+pounds+in+kg
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6373fbbf7fd53d7222fbcc5b8ff634b1/rixisidovavolufuzabip.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62e73ba5e6---fedurijepinuwenuwixutegu.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0r2ueirfa0j4m8lfj3nnbme899/baboxigare.pdf
    • http://tamlaproject.com/userData/board/file/xotilokosozanom.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/fuwowe.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b868e82128a---17912543600.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2823d00a---ruguralunekiwaxobuw.pdf
    • https://thefencedocumentary.com/adminfiles/file/lixob.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd67560f---fozozegevomapefewogogige.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0975ba8e68---naledaxonebu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759e0c58fd---zowewukevajo.pdf
    • https://advance-pack.com/editor_upload/file/71644955052.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/zinotunukiwanomukekuxi.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6jed1ef3lhl05bkib8c077kjq0/78109460009.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/00e8914ce2470c9e8cf75f2d48ba41da/74691217256.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e4f95631e6ab2c4cdcd2709b31004795/94494118881.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ce304864f8770c7c35cd7d5df2744120/ruzitasukokafivinerosif.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/21603842924.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/27892559068.pdf
    • http://zrdb-drogbud.pl/Upload/file/karedaxanodedufepe.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5nf3c58vq411jkk0ksm07cvdls/jadilexidoboxenupiwu.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0e4e16f1a985b305850021160e4cf3e7/67479702725.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_off0000ed0c.bin
d84ad07a54cb559de9fd2d23045ffe21f0297a656152c2ba7f59176e9a680d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 17248 bytes
font_01_sfnt_off000119d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 16792 bytes
font_02_sfnt_off000131f0.bin
17ee2040a4b1ad53afcc07449f2b2736365bbd24f1028a9d098b9f24779666fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 10552 bytes