Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfad0b36659a1cef…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 17:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1513d59525c3d37e3883eba3129b371e SHA-1: 55f0b61fc18394b74a5034a8096b226d083d55cd SHA-256: dfad0b36659a1cefe7a55221ddfe1bc46985bbbc8bcf4c994dae658406e327ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://kino-cosmic.ru/sadm_files/17214805712.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/um8gfm99t4bqha7bosmjm9a4g4/58435019287.pdf
    • https://monyetjoget.com/contents//files/gexatapuwinejirotigefo.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b562a1853687f7aee28b94d638782fce/2155355587.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1769b158ko0pjild4k2c89f0s2/moguripux.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4896e5749cbecd9d4f0e2e975ebc0e45/zajuk.pdf
    • https://jagominum.com/contents//files/63307634047.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3e09aced8463b69b74a87418c204de09/nudimeniliredokaw.pdf
    • http://synthecinter.com/userfiles/files/wamojav.pdf
    • https://ratsimae.eemedia/contents/file/tarupedabanojasavawu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/02acf5c7a36e01fd0528769aa5b6c470/87552416298.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607961496e2ef---kexifinar.pdf
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/2c09d86519cbe72495df97a7e3d66dfc/sorife.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2dcd3170---panovedapeduzalorege.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0be5e9d56731d56da929c7e5f0eda579/5786572519.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b955f36d423---52409884055.pdf
    • http://adance0112.com/upfile/editor/file/buzolixibanoden.pdf
    • https://eravukappalpalli.com/userfiles/file/petizirowugodoj.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f91f48889c---lerukafe.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b559c18cf---42627160812.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9c1a0fd0c74f2e23d4c8f6d3e8005e68/96957681117.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecad11dd1d---libodegaxujikogesikelefut.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/19207403372.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160799b3d7c964---dibexonoluwanagimilajiw.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/037144415bc4cca81e0f1b6f52a98143/96139401922.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/7of9tie238ql865hpu3a7u3f27/14970563423.pdf
    • https://hansenlight.com/UploadFile/files/zurapefogipazat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+pdf+to+excel+editable+online+free
    • 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_off0000f969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 16792 bytes
font_01_sfnt_off0001117b.bin
a54b220e978a1ad584d1ae232432aadd95318822142867879db7481bf65d510a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 17024 bytes
font_02_sfnt_off00013db0.bin
8bccf3d481f1c80041f7b353042ad38881e0dbbeead873bb677e264a314650fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 10784 bytes

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