Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b4ea54c7ed114d…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 19:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e278b63b85932eb6649b1a798e0cde19 SHA-1: baf452e57a04d0faa1ea51b51c616a8a10bbe0b9 SHA-256: a2b4ea54c7ed114d03ff280252bfe8534e1d261e736057bdbf04d3bb721d937e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=wifi+video+calling+app+android
    • https://tjpapigroup3.com/contents/files/39506311495.pdf
    • http://diversecityuk.com/userfiles/file/vozejubotuzivuseramemem.pdf
    • https://ratodua.com/contents/files/doniwigixulazivazusaf.pdf
    • http://quartierdete.fr/uploads/fckeditor/file/51288867281.pdf
    • http://gleb777.com/fck_upload/file/tagejixejoj.pdf
    • http://studio-orlandini.com/userfiles/files/70685571212.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432b87cf4a2---61228589712.pdf
    • http://biosite.ru/images/news/file/39018498175.pdf
    • http://eot.mn/uploads/userfiles/files/48028672796.pdf
    • http://changrung.com/ckfinder/userfiles/files/40593626843.pdf
    • http://sistersaviopublicschool.com/userfiles/file/gezerukirivasadurewamik.pdf
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/67759709926.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/27729458828.pdf
    • http://www.urbanwaterways.info/files/94174887039.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/61276c7c499592e3c10899d3841169f6/panogevutowofefa.pdf
    • http://badaranquehablar.com/userfiles/files/20963739809.pdf
    • http://www.gdchgs.com/admin/img/files/gusadarevusogurutu.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/nobujulax.pdf
    • http://pilatesmystyle.com/userfiles/files/69287915488.pdf
    • http://top1np.com/ckfinder/userfiles/files/wemenadolalofokewotap.pdf
    • https://0922.sproname.com/files/userfiles/files/zemujalaxuf.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d91968340---26719785131.pdf
    • http://goodlack.cz/userfiles/file/rogejivarojedujis.pdf
    • https://pr-dienst.ch/file/gigasimadipan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe6.bin
313851caa6125eae75468d05a2f4bb215595b08792290b1540c40b2cd0d98b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE6 15488 bytes
font_01_sfnt_off0000d6ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 16792 bytes
font_02_sfnt_off0000ef03.bin
43a79aa941cba3e5a43045ef9906bc33db1abcf333a3c845d0c0cbaba5905808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10588 bytes

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