Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5e51d507d4a921…

MALICIOUS

PDF

109.8 KB Created: 2021-09-07 00:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6acf1fdf581a36452dcec57432f7d11 SHA-1: df987eccb7c405045512ea1d34aa4143d73da442 SHA-256: 3d5e51d507d4a9210f5c981cac1045ab3a6bcc8ca8ee1d1f038e042cad768f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest 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 redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=manual+do+pulverizador+jacto+20+litros PDF link annotation
    • http://fitnessklub-impuls.pl/uploads/assets/file/8719141396.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pokekabefixegik.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/97482176716.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/pefezagibivovexapaguserev.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zazenivunuloj.pdfIn PDF document text
    • https://lesura.net/userfiles/file/bewutesiguxogep.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/zarubuzizotifowatekenure.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/xasiwunujereled.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/98002399109.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2718cdc1---rasikonanufolojif.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16121ad442dd95---13718547093.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/1544607928.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/radar.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/49200359245.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3e01f1f5---fibixopofapize.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/vakubugutemidefuzerepozol.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/ribidokimiregopulisukol.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/wogewilukanubalimosa.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/boxixakisaf.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf5f1f800---wimilavipugovafome.pdfIn PDF document text
    • https://ferropula.hr/files/22387896506.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210519141644.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/83519859410.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a611cb50abc---ramuvenokuvava.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/22767636108.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_off000146db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 18164 bytes
SHA-256: c0bc281ee9fcc60eb100bfc8d52c831a3bbe0c8be0dec3f16567a3fccb4f0031
font_01_sfnt_off00017684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17684 11096 bytes
SHA-256: 11a33403c03afe8209e2e540b8b20583a43f3414b30764a676da635f4c0d6e81
font_02_sfnt_off00019086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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