Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5ff36c7044e7f9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 12:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4860839cae6624f26bbb4346344e4e6f SHA-1: f4a3f3429b51271116cf0390a64524d1821a4464 SHA-256: 2a5ff36c7044e7f9c926c8da81d4bba922245ecedc36ad16d98c68bac99d143f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://axwelindia.com/uploads/pixepulajejegivitevaz.pdf In PDF document text
    • http://vpsystem.com/files/fck/29712604411.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pg40ltiemcal5j9fji64ggr8ee/vedusibejutofapixeripuvax.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/61979178463.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/97076215356.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/rolimovawuzugadidivusalol.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/burowat.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/87125666943.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/30757158420.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/85029787243.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31901045397.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ed33b8edf3bb7bc06a2e24f91cf7a3d5/gimiz.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/16081414981.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/61425615610.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4fdb2800---43830763150.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/12564436993.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/52017022602.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/dilevu.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/38897332510.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/8583753179.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd60fe58a6---pedowijesarigibowasudog.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/peworajekufuvutimegeg.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/dukagaluwabowexugowubo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/tiwoku.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/869622570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+smsc+on+androidPDF 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://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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 10452 bytes
SHA-256: bda8ab099f6e936b837183b467b2bff5db3de472cb160140ba16e55c3e48c8aa
font_01_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 17948 bytes
SHA-256: 636825cf01742723af2bc524ab03e373afeeaea6b0b28c00dd9fd6df2cdb9de0
font_02_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1