Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ac77b258bc37da…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 17:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a80c8802408c2827387e4b3cd5a6c1ca SHA-1: dc74a500ad25ac854c2dea310212120651adddc3 SHA-256: 25ac77b258bc37da8e2b578fdb17ad732cb361f95d864e8bbe852d1422fd0d33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. This suggests the document is likely part of a phishing or SEO manipulation campaign, potentially serving as a lure to download further malicious content or redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=androdumpper+bruteforce+dictionary PDF link annotation
    • http://teormech.ru/teormech/usrimg/file/5900870268.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/50889486183.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e44096681d---jifigudetegodalomodefe.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138785ec0803---jijuzafesovarokodezewu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f779b48c---mogexitidebonipabedaz.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/181658007792.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/guvamidojadosesutiri.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/13418791207.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pojovenusejo.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/86881001331.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138d787cb9db---rilenewojiwanogatijiratop.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161431e795ce89---9739994617.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/36544064002.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/bakiz.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/jamaminifebekupozi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/34768203776.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/rewazajuxatixomuman.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/dulukatemonavewunugawogig.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/62889051474.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tuvetededazaxigakedal.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/75127047192.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///11094878045.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/kizoxi.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_off0000b1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FD 18132 bytes
SHA-256: a48dc61efc3c3afac80aaa435d8e4b64e8ce4f84d1eb97c9c00337c8bc0c00f0
font_01_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10904 bytes
SHA-256: 6db76fdc6fc2b15d1b8e72cd99ebcf4735c6be744fb842f4b447d58240f2eec6

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