Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5d0eba80cece48…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 07:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 276718ad2ea049e8107a9f01dffa146e SHA-1: 6e37185520e7f230686364de880673aced3e07d3 SHA-256: af5d0eba80cece48dffb5764cfe7937e7a78d789de6e99a73430bb458396dbf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm heuristics suggests an attempt to distribute malicious content or phish users by directing them to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://robotsuk.com/luckingbros.co.uk/userfiles/files/zeletipoj.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9fk6eci29olm2f0eocatrn7fp4/sufijegonosogota.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/pusefawanojer.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/vakaju.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/dibikeburufo.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/95034925336.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/finiv.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/42106958974.pdfIn PDF document text
    • http://zerosquareonline.com/file/69291504386.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d0310a6---kepowiwowodidozek.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/wixugaxibunetake.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/76330583626.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/80773786727.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/gikaberiwal.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c97c4ea29689da45381f5aa30daceef3/16630146171.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/xunirezurewoviwezaweguke.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133495675648---kaxusi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/656806d3c0e29934860ed0a43080c24c/satepebepurijumupu.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210916_215729.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gowakebusuxolaxenatewebu.pdfIn PDF document text
    • https://attack.lt/images/files/pojofozaneme.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/71712044446.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/gowexuneno.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/16358818434.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/92069326917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=add+fonts+to+androidPDF link annotation
    • 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_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 17304 bytes
SHA-256: 7d009a4310f515d0f13a430df6453f5412e88a48f811602b47767f89d8a7d4db
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10152 bytes
SHA-256: 89fb269fead63759d03d4991443e812804144c8769a76a66813dd027bffc9e69
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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