Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb1c4f73423c718…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 12:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a5fa0a263dcf18cc5e94b20e9b54839 SHA-1: eb41b09612ce3ac945cbffc2b10a8b7483114b6f SHA-256: 7bb1c4f73423c7189e919ce0c5ecd56fd907905fc239aa40ef51f7a189881cb7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm used to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16121b03c8121c---21303129913.pdf In PDF document text
    • http://thedreams.cz/files/90999992132.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/lomewitatexifixeseneta.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/alfgsq3nkjkeaiph9sbufe4ltt/28936997673.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dc9200b2edee2a494a247675ca88ce40/94108279764.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/32190718868.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/54645013289.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0808803613da77a4fb6baeaa45fa3923/sufijoxizuragagaxineba.pdfIn PDF document text
    • https://digireg.se/upload/dowewisodoleketekupun.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/36320866484.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/31553115458.pdfIn PDF document text
    • https://banghenails.com/upload/file/92182378001.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/13095903462.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210609_046E4F32C56852D9.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/20211019922.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/67881791936.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb79e8f03---62384948916.pdfIn PDF document text
    • http://baoveantam.org/upload/files/56542778120.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161119026045be---sixudefobedelepowerox.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b299d084205---mumafoj.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/funitadotatuxamulodukoku.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ne503teqfmbqlfdlla3c4ubv5p/52897017999.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd07e530f---97675808458.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3rpvfpv2c6ttbbt4kcd9gl0j0g/nopitaxufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+snake+haired+monster+pdfPDF 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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 10772 bytes
SHA-256: d8460b1a60b41c6e061dcb8747e0ca53de54583f974ce92aafec226d5e506193
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 20424 bytes
SHA-256: 430bbfc01edf7ed7a8883e719282a3cae3f58cda2073e98e31d4a67f44f3af3c
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1