Malicious PDF — malware analysis report

Static analysis result for SHA-256 a316c995ff253bd2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 16:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 054b6965b9e9d227096c3749371e833a SHA-1: 5b71940007b35f6d85b7ff2db057c88ca86e1fd4 SHA-256: a316c995ff253bd29bc321cb4bfc98e39ceedf6405210c7c71468bcc7bd3bbd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such sites, often used for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=batman+dark+knight+rises+android+game+free+download PDF link annotation
    • http://altelaw.com/uploads/image/file/24685585574.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/tizopasanuvudeguvepopuk.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/50004334804.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/doxaf.pdfIn PDF document text
    • https://petikdaun.com/contents/files/28238578559.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cc39988869ce7609da6cd4fdfa6d5676/fivenewedejeloripex.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a5ef1a5b045d8e39774e23d93228f4dc/mufisupexa.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/69904323345.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e5386ec76496422817db130e31ef8e53/menodolu.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/28184341241.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161386afe85cc9---musawedejavo.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/27482882628.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109060921315742.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/jovolotupuwenukatulemivo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b400f00dc---fijenipapof.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/wekinevuxo.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/70319210574.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/36443893570.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161357c8397790---84923875056.pdfIn PDF document text
    • http://master-vin.ru/files/file/vamotute.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/lukepitixozawitunokavetag.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/telanagegubiteru.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/57590745067.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_off0000c249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 17160 bytes
SHA-256: 57e11f5cc230f8658df10c12b6eaf4b641f332ecad9e36787b43470db1981630
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 11032 bytes
SHA-256: b887a1ef8b482c6706e21fc0fcdf1bd2f9df1352607cf788a77dbb61d51f6caa

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