Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaf669eb0ff1a4d…

MALICIOUS

PDF

80.6 KB Created: 2021-08-14 23:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3871147f7fa4045e9236f232e368673e SHA-1: 0c80b5dadda58f4f96a3d2cde48d53db270ef744 SHA-256: bbaf669eb0ff1a4d071a7ddf8140ca4e37d86e13c6f07a259d2c8d34468e9e31
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://melz-feu.ru/upload/pazimox.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6e1539f2e1246b1fbd823c62c522f87a/faleniradunazifeba.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb3a84a3b7---xosusuxojuniwowasomoni.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89192289705.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/buwapolafavuk.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i1lp0d94d6b53atsu8dtnss644/87514675004.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/vurebam.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/xulefojabalexalatezujenej.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/bisepuporo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/262d0bb3c195e26cc191f203e4910876/kokatagazurazezivok.pdfIn PDF document text
    • http://mosjob.ru/images/file/pufakanifegonowisoluwupi.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/39504890309.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/50061789834.pdfIn PDF document text
    • http://falerisztika.hu/tmp/jesinupezububadatesep.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jabumijowubapa.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160725c66b3574---70284342255.pdfIn PDF document text
    • https://sanidom.pl/img/file/lexakidirebufobofe.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3282746105---xomidoxemafomate.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783bb78795b---tidunomugusuv.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/mabagoguxenebiko.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g5mas4fkib6qbnmhjshrc8lahp/24533722553.pdfIn PDF document text
    • http://contua.org/userfiles/file/87698121219.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/mivatugotudokimaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=juegos+de+purble+place+gratis+para+jugarPDF 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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 17112 bytes
SHA-256: e16d33960b31be4b52b565ef3193b600128ae617d333fe13cce10d34f49aafe8
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 10948 bytes
SHA-256: 12e672fe7c15c75db4c2d0278bea7bae1184ca031f3c2544325fb236ffdb643b
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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