Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e07716584ef5405…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 00:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33eaad546587388391e798dcf0c58913 SHA-1: a6a4e2dacc9adf15a3635e0be0903cb7059a0a69 SHA-256: 3e07716584ef5405aba3b26c14c98d2c842ce2f68e55c8f4f40a06d063fb738b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to external malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tedesco.pl/userfiles/file/43957454066.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/4548469453.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fad3ad450c4---vexalar.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/83fc01fa947c38c1f35a9cc2a8776137/86251844110.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/wolamekiri.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/65171156988.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160710863c2277---7790773110.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/54729593850.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86ea5da51---76188843361.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vibimolali.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/49862395009.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/bileraxarenubudob.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/85057420423.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/gulanozudajamojominepaxep.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ded77fab18f9b28cd75128c8c379490b/23726877816.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/32200147062.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/36c45e4fc33fdd6f8a4d1b379f33a5b7/60867598674.pdfIn PDF document text
    • http://secretinvitation.net/images/files/xakasezakowobodepin.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/904d17c2bf07208b60893c382b459398/nekadipunejugonuwub.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/99520860623.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/fekesafomopopamuko.pdfIn PDF document text
    • http://gtshotel.it/images/file/74989709635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=capo+for+key+of+bPDF 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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 10220 bytes
SHA-256: d864c393c1b8541befdb466ed8f1f730260cb448bbd4b34ca5a12f2ccd3443e5
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 17812 bytes
SHA-256: 96eaf3b54a5af3f1adab42341886f52e86ae2676e24a09d62edb852622f1f379

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