Malicious PDF — malware analysis report

Static analysis result for SHA-256 424c31ce7bbdfa54…

MALICIOUS

PDF

129.3 KB Created: 2021-09-08 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fd9711c80cd044a8ddc7cbd51cade0f SHA-1: 2c6c5ea05614008f959a0c62aee937bc003b62f0 SHA-256: 424c31ce7bbdfa549dd87457cbec87a3018cce38c19c8ba2957411203c4d8cb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://irlanc.ru/uplcv?utm_term=protocolo+empresarial+internacional+pdf PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/532e5cdd0f323895138dda7e4610bd5b/wilizigorasulejobutuvo.pdfIn PDF document text
    • https://windsbs.biz/files/file/55412291070.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb7743df4---9207995991.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/lomigotofem.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608033717b6bb---pikidogiridejubebanu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f07a07e146f---39577645825.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/62802939663.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zapufugokolizip.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc0c08f62---biribofokodawetime.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/68548069920.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27065231508.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/91775577256.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/20303271623.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/882328ccf542cc89ef652b44f21e61e9/22409243306.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/vanuxukugukum.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b9ab47f2636718ac63c2a6767f33b6e4/62413704002.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4e73c9fe---23918341264.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/29981dc4ad0386a32f24e694f24935c9/23655699227.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5f147a67851dc66d801f9a2a90ea5c15/gobefitaledopoxigikavolu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae4247de7---73733403869.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/49487806192.pdfIn PDF document text
    • http://cmtsport.com/pliki/54135889823.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160834f7533eb0---lumeluritaluvivejelulux.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b39849f64c---63457176152.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8ebccd7ebb0e95efce181684cc9ab5d9/79868638074.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_off00019116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A928 20632 bytes
SHA-256: 5610fa5999d41800c0ff9614c08d137c05c4032e2fff464e08a99d4537cb116a
font_02_sfnt_off0001de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE77 10780 bytes
SHA-256: e9f5bf671aa7aa1eae701edaae5fdb3071b161ebbad9c13ba58dcec6c749e8bb

Open this report in the interactive analyzer, or submit your own file for analysis.