Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47cd37832887ad5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 03:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fecc6b8c26f3c664f2562cc2241b286 SHA-1: c7b6a270d1ea5b3636872515f0ca33379232e3aa SHA-256: c47cd37832887ad505b03800fd290665eb16fca256cc25da19eff3e27311944f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using disposable hosting and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5564cd524c33ca82f57f818e89eaa2cd/suzabuforerixabozaje.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/44706278959.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/540352839.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3bebd1137---xedusodifasumubix.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb740e4ab0a---11612224795.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/48329359757.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0b3c70eae737141f84cc8a13e875ac33/57242065183.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c0a5a423aa134ceea31f87ecda530254/xidopoleragononinizerarux.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/40601808544.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/95757983103.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/57325652416.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/2ab260f80535620eda5cc0b67c145c1c/xofajokaxupozoribetuj.pdfIn PDF document text
    • https://qkon.ca/images/file/latebumitenodur.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/86cb7cf8930ead9b00f27deb44a0f8f8/wobejerolunoz.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/22700895656.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/22422391326.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/944aec7066b29a601348edf98196a180/90484468423.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/vuvugavuw.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/zagituzaninubufukasufu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16096b47db06c1---tuxujitupejigibagunawi.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210622_1A5581F9912E628B.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/lurefo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/mefupup.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/49031ffc9568d81097e58ef5f79bdaf0/paguwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ohsas+18001+pdf+greekPDF 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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 10816 bytes
SHA-256: 9c7e124abaa204d42857a809748f235fd001e3bf96f53a63ff50773ca311d1ff
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 17820 bytes
SHA-256: e3595744502ab8716e040d451c37065a5650bbc15c0de8c585e512a320580afb

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