Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8917cd88adbf75…

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 01:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 97be40b846d9724c9268265dea77fa20 SHA-1: 8ffa5fe9dc73df77e83b828ebb1dadcc7eea9478 SHA-256: fc8917cd88adbf7503052ecb806750ae1f4a3efab6175df4a9a5d6c6801040ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the true malicious destination or to leverage multiple compromised sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5c0ad9aa5---65996460212.pdf In PDF document text
    • http://jiin-torng.com/uploadfiles/20210822022018.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160889d5a352c4---foradabisodabixeva.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/90422517343.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/2884186940.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/16372364059.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/53137058549.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902195923313019.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8fc3a41ce8e90f7f9c7213ef116452a8/43454762275.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160846d21a2f80---nevoxenu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/97717791609.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/muwibik.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-01/60d2a7810b8cdb3e25e93f3f7d10b5c2.pdfIn PDF document text
    • http://vo23.ru/upload/file/vibojulivonuxu.pdfIn PDF document text
    • http://poorclarescork.ie/images/vidiriwotuge.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21955e61c4---pexanuvopawogumilelap.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/147564838b46b73617b510f082490478/42785353107.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a331608f54005fd32a3c2e6bb89af454/buvelunekovebosamodisuzet.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a94505c7de8---42838347679.pdfIn PDF document text
    • https://shidoremicrosys.com/media/83249467811.pdfIn PDF document text
    • http://splogservice.ru/content/files/najuridolom.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/gurujisojis.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/janofomiroxofog.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106221702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=contoh+soal+psikotes+matematika+dasar+dan+jawabannya+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_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 11356 bytes
SHA-256: 6a50f4f81c8d2a596d8f99ef16482c9c6d9233c08aabb1e605ff16c5f21ecb8f
font_01_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 19552 bytes
SHA-256: 780b0d9d6058f39ab7134859a11f204fd099ad6c3e7dadfb42d73b2b2631e17b

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