Malicious PDF — malware analysis report

Static analysis result for SHA-256 25db9e38890344a7…

MALICIOUS

PDF

160.1 KB Created: 2021-06-25 12:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 78c95d75474c6728ed28c8c0dcfdc515 SHA-1: 518d091fbfca6cd72169775ffbdefb62304f9743 SHA-256: 25db9e38890344a7497b6fd299eef3ccc3914cb092cbe8ab088f0615176c513c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous URLs hosted on compromised websites, suggesting a phishing or malware distribution attempt. The presence of 'utm_term=download+complete+pdf+to+view+all+pages' in one URL indicates a lure to download a file. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5da72e8bd---78324508852.pdf In PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/ruxanolefe.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tnbm8teb3cr0lu9mncao37g0s8/jofepakopubuzak.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/87155609864.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607504017de9c---sasobogetini.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/q4b3p813q9u3lda39lk5bfdo36/51772553919.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba596df2118---juguzad.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5861018ca3---pefopadofisipazimo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160798db0363f4---tuxopusodegot.pdfIn PDF document text
    • https://vestol.bg/files/file/7200185434.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/36916262981.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/xogugujoda.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vkaej3thivlkdc3f47hgk4k9o3/supijula.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7b8f3f96684f7db69b5aca5c5d89bd29/42084661780.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pixigenirilov.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa93b013903c0f8bb2d5f318fa4f5b80/74468059008.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/pelixala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+complete+pdf+to+view+all+pagesPDF 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_off0002125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2125A 17376 bytes
SHA-256: 0e6c7eb030b6f70b7a8d41d3cc0609493ab9bb985f99be3f1710aec07ef2c1cb
font_01_sfnt_off00023fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FB9 11016 bytes
SHA-256: 86b063b430c504a34f45359d3f8520eabbe4361af8a302757a16884fbc6a09c3
font_02_sfnt_off00025930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1