Malicious PDF — malware analysis report

Static analysis result for SHA-256 84665b3ad3a46940…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 20:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5e7b371b5835661db31da9f31c16011 SHA-1: eb909f45e8e2e6220db072e88fe7d24a0b708a0d SHA-256: 84665b3ad3a469400168d00f52694ed69ef269f1bda8454fe6fe417171ef302f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of numerous external URIs and link farms on compromised WordPress sites suggests a phishing or malware distribution campaign. The document's structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=multiples+of+6+up+to+200
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd289acae7---pivavotipigupokefurum.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/navuregep.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/bfe6a2a5fb1220439de8265454eb972c/sonataxaluxiboregizovet.pdf
    • http://rogo-rotterdam.nl/files/15266924313.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/suguremolutoxuvibama.pdf
    • http://kojeneckezbozi.eu/userfiles/file/3104112275.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/zudazufuxiwifagunonava.pdf
    • https://vannordenvastgoed.nl/userfiles/file/viwovawoxowigunorujawaziv.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pc5dgretm7prbghjlkittdfd76/12513720825.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/034b9a3b29412c5fababa6ab75dd833f/lujexotatogok.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b3239a6f7---valomiridatekidisu.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/v44mhah5u34uf0e84olnrsehga/tikoput.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/3339377200.pdf
    • https://ka-base.no/images_content/file/42352180062.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/112dc2511590bf365a7e92af82eea8ab/87560587672.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098713fac4cd---vavafomekotirugivurulux.pdf
    • https://nanyangtextile.com/userfiles/file/wataruvakazexewokeje.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gjrfu2tdcq8iu9epqul3e940v3/15039349268.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/of7i9l3qar336t4pn99qcggk7n/mebisogojemopojubuwub.pdf
    • http://lawrence-spruill.com/clients/42275/File/24896255249.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9f4186fe---sixafemujowizadozigazukog.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6b3c6100fe7b5e1410949496177b7759/12974683512.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_off0000f045.bin
ce7af5f57fc85eee19379a6da81248de39459b360703335df2ab9608a7852a27
pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 10488 bytes
font_01_sfnt_off0001084f.bin
90a545da22e369c2a3d0a9f8139b595a27619c9665bfa36a8194376af75aa4c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 16336 bytes
font_02_sfnt_off00013292.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 16792 bytes