Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc8e220d7a4ebc8…

MALICIOUS

PDF

111.9 KB Created: 2021-07-25 23:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2a77e48a20cefdc54f46fd737f66000 SHA-1: cffdf6787453477eea4c35a1547f716fdc7795e7 SHA-256: 0dc8e220d7a4ebc8fdaf4bc6a6e2569b2244283a1c738ef991c44d26de594dad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs likely serve as lures to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://thaoduocquyhiem.com/userfiles/image/file/53281720838.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160851434a0020---59106025093.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/52822800218.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16089526a414f0---47035960535.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/21183000959.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bd7c917fceeba02a983dde4e9c28ab0d/32700457691.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/23524060593.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c11cc7034e2---zufifedexawaboded.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/21431017145.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/23779128707.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845da5561a7---61031357439.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c630764b5d2---75689393050.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kb5dacs46j06ugef18rp2lgg94/87992629326.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gebewunilipurasaj.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a471f63d31---31438528788.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc0153b1f---43630082043.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faebc07c11---bunupulur.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/55c2bb20cb905b2c8df84b1563d6c547/23044304206.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2266a207699cfe1da97351f85a8cd20e/52281010360.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/fe47be834f43ad7402f0eca7f2f8e132/16521650584.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edf60163f2---85987340073.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/86226868480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=network+security+essentials+applications+and+standards+pptPDF link annotation
    • 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_off000159e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FF 10876 bytes
SHA-256: b9d720ce21eadc71e073edfd3d5da5c3580b908cf2287c983c33fe6ff51d364f
font_02_sfnt_off00018b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B5F 17040 bytes
SHA-256: ce6c301dddb51c1c122eba9ff6c94bc5109bfa7d2f86c0b5f5ed32db30f6cefa

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