Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cfad357a25a166…

MALICIOUS

PDF

77.9 KB Created: 2021-08-30 19:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51dddc11bdc90d177a8ee7515116137c SHA-1: 7037a0627df5c5d938702182934cb4ad6dfaa237 SHA-256: f5cfad357a25a16671023e77b6f08ffd85833743fe90f366f0feaef3366013a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URI heuristics and the classification as Pdf.Phishing.Trojan suggest a phishing or credential harvesting campaign. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=trial+master+file+reference+model PDF link annotation
    • https://doganagolosa.it/file/wepozanimulisopixeguk.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/25420998371.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210713_064227.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/15179005813.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/68722ece4739f35786990f055d9a8ac2/52356390470.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e255935b30a---nutivozes.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/vofumosavobug.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a105eaaa51---67506310962.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/t9rvb6mde42vs52cu2e3iaulla/23361382635.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/89131153895.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e2e8e0778---72658907295.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/30054970336.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f310e65e53---85949211085.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722fba25965---61952699047.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d1438b3dc---15985678005.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/vozimodifiguz.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/79340273608.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a80053d5---wapeza.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0c8dc0b1bb1c5e5c8f6997dc52cb1edd/48284745920.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/xugari.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hsr6rnanil5ugvi108gssf15ij/lezijutebibetidafal.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06f7b901a---jelaxuruziregedip.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2c703576---sejodukolufawubilegafewa.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 10600 bytes
SHA-256: 09815199d81991924d33f4ba85a78a9ff74d326b01cedbf245dc475b9f96001a
font_01_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 17524 bytes
SHA-256: c1ce6a9e69aa20f09797705d1dbae01bf86f3fe743c162c0045fd305906fe747
font_02_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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