Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a5dec8cfb26d68…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 14:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2d6ba84ee7ce1f70b6346603f7c7d25 SHA-1: 41f7e5f75efe259ea4db8d89b3d8d9ab859ed69d SHA-256: 95a5dec8cfb26d682aa073b97bd2833987172b04869a921222b18bc52b01a874
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, suggesting it is designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=11th+political+science+book PDF link annotation
    • http://cedule-plachty.cz/files/file/kimusawugasedofixojezu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160894c9b1e02d---88690074008.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/53768990836.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/julid.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a71846fe7---70191926010.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69be9e5d1---75462394463.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/luvakawi.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/fiwolig.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b019c1ae7c20662556af95e4ee5f2816/jajedamafikutugez.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-18/20210518200459482731.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/liwubudotokelesovezugox.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/18554958006.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace16db42b5---45826412157.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/19462693314.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/54183765881.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16071f69fb69a8---fixezijawuxetefex.pdfIn PDF document text
    • http://funperm.ru/content/file/95095698232.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/18410348750.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6eeb9c065---71051785666.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1c507685---95980219025.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106120918567172.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/35102312921.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/84101767651.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ed8qk8tgek7mb1b7na320p06e7/74154169690.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/lonuzujatigo.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/33d800535d0ec8ade6ff6b4be9664100/ludoraxarosegomirigu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/693a3238a6640496f2b2df9c7616346a/fonazom.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/25837da743a7eccc97f6054c3cbe5b0c/vojuke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 17796 bytes
SHA-256: d03f09408443d43adfd222d74f7ae2ebdc8a5c7d9003468480357d9ae5e8bcab
font_02_sfnt_off00013829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13829 10560 bytes
SHA-256: 06f2c66cf48fd75988a38ac56506215183e265f9d2cfe02015553fce2dc816fd

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