Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a015ce7e19fc18d…

MALICIOUS

PDF

128.8 KB Created: 2021-07-13 09:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c22ce49bab456df87f3d8e81d9ddd6d8 SHA-1: 2fb1cc833181f088502c102db6ad37c670d40a94 SHA-256: 5a015ce7e19fc18def23149fd390685ce938fe2a3096914f7e5b54a168c51c7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm indicates the primary attack pattern is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://wastran.ru/uplcv?utm_term=jobe+empty+can+test PDF link annotation
    • https://eingangrad.ch/userfiles/files/24058179410.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b926d52f42e---49467750209.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e23983992965dc40747179a8b5ec7aaf/58299901808.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/97876206327.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/42007290148.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f852789fa---28573646817.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/64987169092.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/24627220484.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160995fbb54f32---poluwugakelijevuz.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b5ejj21uo2v8jprrhcft2gdh86/65441560324.pdfIn PDF document text
    • https://anfauglir.com/images/file/20481645053.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85a38a851---74860543276.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/16854395349.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ebb8240ae---kabaxipigelifepigakoj.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7067ca5c2c9beb675e38eaa9bd0dd859/lofam.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3kmc6n2mk5nqm3ojklq66sv0m3/30350674015.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20cb406bf---32477256283.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/400160741.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4b6763975ba3448f27a605e09d3398b1/39724933669.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/jiwetuzutotiwaputuwaki.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1b73b8af5cd78e5f82b65088e83187a6/27229554345.pdfIn PDF document text
    • https://petala.gr/userfiles/file/23903184797.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 67268 bytes
SHA-256: 75aaf1f51b2f5ebd9e70d5bd7d0cc1bec285cc949107f0db98869baac5fd6bec
font_01_sfnt_off000197c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFDA 10544 bytes
SHA-256: 71755b529051e024b39b5b6db4ec8a36ea60a4ee4011139f18ef89983af08a94
font_03_sfnt_off0001c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7BE 18280 bytes
SHA-256: fa468f74ef1f7b594585c726e78a1b8c5f343d71ceed05b7d59dbeea4906dd2e

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