Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e4e09dd3b5db15…

MALICIOUS

PDF

83.4 KB Created: 2021-07-08 07:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02f851adc66b6cbabc2711a496faecf1 SHA-1: bc0fdf46f5fd20742bb2c6b78a3c19c6f70737c0 SHA-256: 55e4e09dd3b5db155c752e98c8e0f7b65df6916d56eda91f47907386135b7f78
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 identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=how+to+clean+plastic+toys PDF link annotation
    • https://svingenieria.cl/userfiles/file/bugituzeroluxumepesuwura.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0fa01c7ad---84713521112.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ae32f7db---42895301618.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9395c1d33---diwazeboxugo.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/67581971749.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d4f63953---nikuwalefi.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/kanesini.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/3k45bnl40h0esgg3v4gi4p8toh/nikagumonaxapuzobakaraxez.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/naxewiginomit.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/zivaladasa.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b9115c21ae9279990154823c73ca9cc8/59148982014.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/tazafam.pdfIn PDF document text
    • https://anfauglir.com/images/file/dofuxudenimo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b6da45ae7v459jk5bjoqrllgdl/14532158402.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/6915516421.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fafe86c58c02a37fe54af9993c87e3d3/ruwijiragam.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jol4d5vtdnsv475q6l095n6s45/88708704479.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c5805b27cff447d596287e1f80c0637b/nudidisasudorozozemepibu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/82305c397e42dea201453e6211ddd34f/66937568401.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/63307377541.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/26159926288.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/lakizijiket.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/36981885335.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770c1de6e8---75578449136.pdfIn 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_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 10456 bytes
SHA-256: d6ba5cd496869607cc7650ab0962d3464d10d6eb81b4a0dba1c0869b20f24ddc
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 16568 bytes
SHA-256: 53ac6db6119def53afb44100ddd6209da31f225d989961041b850c2833313690

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