Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c21b793a3e0888…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 15:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69c9f961c7b6ece27288f42c4234708b SHA-1: 7ec57037add833296ea9853708155650a4f67355 SHA-256: 84c21b793a3e088889dd84efd68bc2f259be5e8b5879eb911b5062716edd1d8f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to external URLs hosted on potentially compromised websites. The presence of multiple external URIs and link farm indicators suggests the primary goal is to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=html+email+guide PDF link annotation
    • http://www.dkmodels.net/ckfinder/userfiles/files/28518494593.pdfIn PDF document text
    • http://lawngo.net/fckfiles/silot.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/sikiwowojaxatesivafifovo.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sefegug.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a93416031---77104252002.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a208ba592e69da76406aff3fea10378d/siwutonusoruvuzogenif.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/6291530848.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/zumuwamamejolo.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/jedobugomojabavose.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc049bff4---28237973048.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613244dc1e794---40527868142.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/71695843128.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/78998989218.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210911162606_164812224.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zitoxifivagugi.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/16806428817.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0baa5f09a4ab94dfa3f7a27f4f95d6e1/76657875381.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wuzofofopevigagaradu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9fa1b1a564f429d4c85c1512db203276/gopirimesobawapetipaxa.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/42371624100.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/73425085089.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/36789258953.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/84697546914.pdfIn PDF document text
    • 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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 15160 bytes
SHA-256: 5821f50b875d0f6c219f3e4a1f3af23653419c5ed9916bae9544c52b4580b83e
font_01_sfnt_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 10192 bytes
SHA-256: 48d5d1c3d7ef36e855f06129e4442a2146ab9cb661d0e587296d576aac402ae5