Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adfd7ae61cdd06f…

MALICIOUS

PDF

78.7 KB Created: 2021-07-04 20:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 307743485e520db83a71cf1ab8fae7aa SHA-1: 0e41ec789acda90a237cee70cc5b5a0c98a6fa5f SHA-256: 5adfd7ae61cdd06fa4e4ad93964d13b2ac8cf64698388466599fe93ec74a2636
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and numerous external links are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b48644bd981769f015c47da340d26afa/39703188587.pdf In PDF document text
    • https://globalmediaminds.com/uploads/files/96992530775.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2d0a533143232d793aedcd93118424e/mabekekidifapa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b51bda7b---sofuzab.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p0r8uvovs5jn56gr76msdb58g5/55586975428.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607627a400844---vunufojajevanaxufalanofi.pdfIn PDF document text
    • http://polletnv.be/uploads/files/73095077574.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jupofolofasijabuwudarozif.pdfIn PDF document text
    • https://banghenails.com/upload/file/76612472842.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/nobut.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45305672d---97032215080.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/75882817066.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/57751264997.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ebf014dc2e90ae100dea3e67238bb6db/kejivatilamiwowumuzefaf.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccab4e8c9---59854763833.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/3384041941.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062404535315.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/dsndh7moq668fdgd6knea0ooqv/96027121209.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cc47340c378cfe6e7910bcf5602792c3/fupaloteviboto.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5ce8210e---ratitilegazino.pdfIn PDF document text
    • http://sciattella.net/images/file/jepabejevulatu.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/3343877598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=r+reshape+long+to+widePDF 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_off0000d085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD085 10800 bytes
SHA-256: d103774299944f4f51aa1418c7f26c4a0ed611adc8860718cad6fba2523e3ad8
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16916 bytes
SHA-256: 2b69becd4a281869c9bfb17eb6cde6f3ae6266512beadac663b578c991a832ce
font_02_sfnt_off000115a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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