Malicious PDF — malware analysis report

Static analysis result for SHA-256 803d73c9c3d15e74…

MALICIOUS

PDF

95.7 KB Created: 2021-07-18 23:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90ff348783730860fbc1d2b76fb73af1 SHA-1: 49892a680e1621ce4a7a3a88811bd4ce3882c789 SHA-256: 803d73c9c3d15e745a2003fddfd436a9475d6749561f31b7e35af0b3215c1b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the uploads directory of super-forms and formcraft plugins, suggesting it's part of a link farm designed to redirect users to malicious content or phishing pages. The PDF itself is heavily obfuscated and contains no readable document body, indicating its primary purpose is to serve as a lure or a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/6af5e82e61ca12c08a5d6aa1c7b4e015/98589052847.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3ee4afdb9c00e1e8c9c52b412d279378/1710697515.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/38314986056.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912b7abc79e---83092872537.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9a4931c5---32975701245.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859dab99eee---8426271782.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/80977803693.pdfIn PDF document text
    • http://anpo.vn/upload/files/83733604811.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n5mkod8rs9s6m5c0oouscqtsr5/dasasijibu.pdfIn PDF document text
    • https://ak-oroslavje.hr/files/66518283538.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/21053866825.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9qopdlpl2pgvq5461sa4f0kcmq/navuri.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57fc8695b---50817724798.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/kiravepojuxixodijut.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/94344085155.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607430d0e0d9f---wasasewoniromuranimonenir.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0fcade424---xinegaputigejuzolewa.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/segopikorizemojirabediji.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/49745465292.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-14-02-23-40-54.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/85b819cea35b70be9947b95736374e14/52498781610.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/1349014758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=yes+or+no+tarot+most+accuratePDF 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_off0001124e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 10336 bytes
SHA-256: b1ae461dac0b58c0a7d5a4deb9336ed3d364b36d658228f7f4a5beaa789c1d46
font_01_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 18220 bytes
SHA-256: 7ec23998a244bcc50a0b74dcfc00bb4ffad18b0348c7f9d79a905a1191c5a765
font_02_sfnt_off000159ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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