Malicious PDF — malware analysis report

Static analysis result for SHA-256 76589d836b12686f…

MALICIOUS

PDF

95.7 KB Created: 2021-07-28 04:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cba59cbd2fc1e0673ad0ab16adbc452 SHA-1: 32dc529958e687f5a75b9b5e55af0372bc3aa687 SHA-256: 76589d836b12686fe1037b857ee8b57451c596c762ad8fee7cd6ea3a93b97843
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2977

Heuristics 5

  • 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
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de0d660548a---dedameretelu.pdf In PDF document text
    • http://massimosusto.eu/userfiles/files/42852862383.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57951297---mofulebukufaranerapow.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ce66c84bd5645a96fd22cc56c3183240/56728596393.pdfIn PDF document text
    • https://bloomeng.com/uploads/21126423869.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/28502233332.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdefb202c5---39463980869.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/40707377034.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a96178e9c768f23ef9e792d4e543f907/vewebajeweduvew.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/18197591959.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/42337305989.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/deb82676441563086eb10f4126c6d520/28686327225.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/vodidonekilekuv.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/j87otb0a1uoc125joiov7pk3bo/86424473764.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/47607702012.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0b9c5bab---14909627037.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/7483433377.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386a45445e---zuralovukadarebap.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/12109014062.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/819fd7088166b718c13bf60743ef06e6/paxoxeraxuberarefa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5cf89556---vulojimuzapo.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/vsh155b7nb7khr6hbhmg2se1gt/5959294597.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e98209a596cd8612f0075ecb37b870b2/tanorid.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/juxufako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mcgraw+hill+reading+wonders+5th+grade+answersPDF link annotation
    • 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
stream_006_off0001739e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1739E 4857 bytes
SHA-256: 404e376c6cac6accf987eec315d944c61d3eb8cbe187ba2336d2bc319e889b93
font_00_sfnt_off00014294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14294 10864 bytes
SHA-256: 3ca441c008fab181909f090621cb0885abbd459fbfc736d20138077f19c33857
font_01_sfnt_off00015b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1