Malicious PDF — malware analysis report

Static analysis result for SHA-256 98349b31f5231720…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 16:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d096e131d459b8156c89f0fb3fddf87 SHA-1: 1f40d132ef7086febe5e23f98df2c6c331e52d18 SHA-256: 98349b31f52317200be5e355523fd62605545e80d68285f8629f696e269149b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple external URIs and compromised upload links strongly supports a malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=ratio+analysis+mba+finance+project+pdf PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f95b9d1---4411597722.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/14e731d1d2c6d473ecb22c7212d3d00f/ritijavegikofumetap.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/xinenokazixer.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/911e47b33359fea19bd7a1a8d7ee19aa/26366327789.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/61194451331.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d8b2758ad68ea41e0c2f9c1f7bc483b1/wixozoto.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05ab0d5f9---pipojorad.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4lsv5qt25r8t6r276q32hd607/52070759163.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/lunuruwezelil.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/81923364540.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5a8tr58vtmbf7k0c6q52d0v9u2/59649036157.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/tazofirawonuke.pdfIn PDF document text
    • http://firegallery.ru/img/upload/vipunowu.pdfIn PDF document text
    • https://drsoleimani.ir/userfiles/file/napenokupikavogi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bmq590uckl9icf44j69l1bm6u2/vuviredadinapewana.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jebedamujamifa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94772d5b86---38302738174.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/46286362474.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tejumedawowu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qv7d8pj12i7nr3epnhne06ggsm/42238932859.pdfIn PDF document text
    • http://www.heksan.com.pl/file/18198618550.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/83384915666.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/51016780753.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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 15016 bytes
SHA-256: cc0a2b07adbb3bd564ec36760bf9c0467848b10ca98216d88f2b70136bb6f535
font_01_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 11212 bytes
SHA-256: a07650cedc0a30839e1914eecc69438e09c23f605e204f5836508c093289ba6e
font_02_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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