Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b2a51913bd4de…

MALICIOUS

PDF

105.4 KB Created: 2021-07-23 00:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 766344048828191eaea9fa8d49f8b5b2 SHA-1: add381e5c06cd9f80038bee6f82390abcb558617 SHA-256: 078b2a51913bd4de060e81b4a1eeaec20ea60d9211a2996521fb240ca7e42d30
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://littlepearlbooks.in/data/eimages/file/8764612894.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2683917b6---vesovaxosok.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e10c4bf9682ea61c0be61315d03fb8c6/78623306405.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16230484661646.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5073ad8cd20adce95e2f1c8899ee71ed/78005464314.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/74612969411.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/vuzejar.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/24573170939.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/nugugogaxipo.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/puwiwo.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/73433453941.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/tirunafagopu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/dezozima.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2ae6362e0c1ebbddac9f1f595fea1de3/tukabaxazute.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da761a4b4---sedilujeloruxufixok.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e7757ee18f2ff4fbd1e647b5bb92cdb0/zekogalogebi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996db59a8bc---loneg.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/86820863410.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/vinivozagimosopan.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae258af6f---kisuzezifizamekolodil.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/90c59b4b2b95e0e22a61174e20332405/72665775276.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e71dce4fd3a---74884196682.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/pinepaminore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=top+remote+companies+to+work+forPDF 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_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC8 18220 bytes
SHA-256: cac38b9cb679ee13d97ed0bfa054c78bf5e419ef0382205acc6b1261155e699e
font_02_sfnt_off00017dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCA 10736 bytes
SHA-256: 8a4a6d7e0b54af8327a66266266aa46314631794614acfe18fad7b0b186dbcd7