Malicious PDF — malware analysis report

Static analysis result for SHA-256 a292d36052bd39cc…

MALICIOUS

PDF

112.5 KB Created: 2021-09-06 03:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ceb72343e012b15dd139897defcbcafd SHA-1: a29bd7726e8d1b3ab06c45b487b5f08deddbe2f5 SHA-256: a292d36052bd39ccd341a00e70515d03bcef71448dca47e1dfcf5aa9474d102e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=filosofia+humanista+de+la+educacion+pdf PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610379d3ca3a6---48158006994.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c3c8462f1d43ec826b42fd5926654dea/bulalirisabuxowamigoleg.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/devosisinufavebeb.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/rapodenepebu.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97968397218.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7431712b50e79c9ec69a520dfa88b177/lananijonobopilon.pdfIn PDF document text
    • http://runo34.ru/attachments/file/36416541209.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/scudqr8f687i5inf238anta6pn/vojusekojojudugura.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b173581ddd540a0603f7b32059b3a006/xokixigavewuvixuf.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/96714830330.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96190477449.pdfIn PDF document text
    • http://salt17.com/userfiles/files/53127223206.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/budifavawajetibiv.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/kizani.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/97912264943.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/iiuahssrc5q1k402fhsggvr046/lawadi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/42589039142.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/94300453425.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcbe11bf19---gezogom.pdfIn PDF document text
    • https://combrooncom.com/contents/files/91138051301.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///rigeduberezibane.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/24567066497.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbc800e6c---gavofal.pdfIn PDF document text
    • http://airmon.hu/images/files/buwurozofusizogul.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080110837d7d---51679261036.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_off00014d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D31 20956 bytes
SHA-256: 4fcd103ec440723a6ca11f6b605488523192d2c4db4a6fbeabde38bfe42c6203
font_01_sfnt_off00018184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001999b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1999B 10864 bytes
SHA-256: d4c9e0a196a37150e410edb26b28df0dbfef0641fc4cc0a496c4ce9f7ae23bfd

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