Malicious PDF — malware analysis report

Static analysis result for SHA-256 2889570a10e32fe1…

MALICIOUS

PDF

89.9 KB Created: 2021-06-22 11:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5c623f301830e619a62fcf16bb0b979c SHA-1: 8889c1f17a7c542a030feada5a4dd7b34308c126 SHA-256: 2889570a10e32fe1724e1e32f35085625b479e96ca254c2f1811f435a90c0dd8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, a common tactic for hosting malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malware or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rs3do4dbvtlhl7aqfvom9rfge7/tegufedigitom.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b1f2d563d1b036760b5d2bf123b92197/83191448014.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/80l5p6cofmjfl1t13bao10qre4/8219780770.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/90743270374.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c560a830---81202933254.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/75425462ac3c26fdc7b48ad100173a74/rufukoxip.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7k2maieuue8uk8b492p5rha18e/40948927155.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8965767cb---nelogutewotamevaw.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c8257666---82592647639.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/lrdlrc79ue30g6j4ubbp1e5695/dakuwela.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082eefbb7341---vinijobexufonanil.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cfd760ec3---jexadipovabutizezozo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb3001eac---26859857578.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/5869726474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hani+meri+moto+songPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 4932 bytes
SHA-256: 418a0fa5c4e144769fee0384444931f8e008ea29b1272739c5131b965feaf722
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 8736 bytes
SHA-256: dfb155a1cd96f518c3c85d9bd61d832794b3e2515d0f6d2c2bf8ff1bff7a22b0
font_02_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 10520 bytes
SHA-256: 518adccfeb6b638235ab648a1061b59189f5e0182f43626703655e0ed549d7f2
font_03_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 10648 bytes
SHA-256: 6b45942e9d39a3e8cac6dca6a3826b0999e9bad7aaec2fb3660d7d253927c6ce