Malicious PDF — malware analysis report

Static analysis result for SHA-256 0517b46ff2f9f23a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 07:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 592c6ab0cbef021fbc4d9e902fc9b7e8 SHA-1: 65cc9ca47a26bd534700b728d6db7bff96115824 SHA-256: 0517b46ff2f9f23afb628d794e3910d849acce11ad7e79d6dc4ad71db54e2c11
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=piskunov+pdf+descargar PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/udab54n0c7n4618ugem4q64b50/wibomovojizoweri.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81a452e878---vimewibovemogaxikup.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/wipewofegumude.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/85f3ba018a20f73e91480548c49d4f78/52958013355.pdfIn PDF document text
    • http://beateromer.com/bilder/file/9316717939.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qstv9avksmqdu2mt1tf6brncc4/14725214177.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/vusawemazi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/xodemuxa.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/gemajikuxiduxasegezax.pdfIn PDF document text
    • https://yuss.it/file/58175188313.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/kemolupifikajuneripowegib.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/nezesupizonuti.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/41436385787.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff50d884b---59480931095.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/1688985863.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/10269812932.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/65769347932.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/konigifujilogar.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee977ee2d9f---takowaxomivupanegupeniwik.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ibri7lrc4hrf7safn4ldvt3bg1/xudolidujemupo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/99e8f2ca25d7c273b9088e490272f66d/xivuxugusuwure.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c1aa0ba86d5e71a7889cdde5588cfa22/joxaxekujasurekojurakak.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/85760750733.pdfIn PDF document text
    • https://produse-zilan.ro/files/36249218232.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/51676182225.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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 10912 bytes
SHA-256: 3a8a787e8e362733aa440d0466abca4c7ad1bb4bbfa5b5e8a1295f7627fe9acf
font_01_sfnt_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 18644 bytes
SHA-256: 18409a5ed832299256892c3c0280210d65e7290991a3184abbfad2c47ce204bc
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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