Malicious PDF — malware analysis report

Static analysis result for SHA-256 58955f08aac3d6f1…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 01:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d0f71af936941645d8c76811fcd44d5 SHA-1: 1f2ad2130d7e9ccc2465d5c11f0759bb8d127bd1 SHA-256: 58955f08aac3d6f1ab65e2aa0b90c3c8dd5f388c07903fb64d2cbff3e2ece7b3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://4reality.cz/userfiles/files/98730611079.pdf In PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/8216061135.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/jobenutupamisetav.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/8547550473.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/maxemep.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vuwosetep.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/kibuvekopirexosuze.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/2092446734.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613647610bccc---mufegizoxajegi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/53220114435.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cf63e11ab8481b94fb23265a00be2c43/52947139197.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/13139839806.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/folusifixij.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138639863faf---xotelexiwagurukapobuvap.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/welapar.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/21783084284.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/tepuvituvivuxejubogawulav.pdfIn PDF document text
    • http://unseretochter.com/images/file/26090886796.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43536306405.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/55682494140.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/sedirixevatirizokineza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ios+13+theme+for+miui+12PDF 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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 10564 bytes
SHA-256: db5b0d1ef2dbdaa04156ba0a7d505ed9e8285f4318df794beb7e793baeb1e274
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 22292 bytes
SHA-256: f7d2545322b3f8dd3c8a4e08e8cb76985af6d5ea1532fc9a9dc1168794119851
font_02_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1