Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21fd2de13f04785…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 03:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb93fc2fe935ca911b115ba4bc1401de SHA-1: eea7fc7933d3dfdefacc9884ea77411d0a272d66 SHA-256: f21fd2de13f047850d21eebfc7857e224ce48c71a29dd6b22ac50440df6178a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://atl-50.com/files/file/pojojetosozu.pdf In PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/jiwulovuvemujuvodod.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///82642622961.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f97338d72---25063669085.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/h17uefdih0i7svf7rkusl8feie/lobemakonuneni.pdfIn PDF document text
    • http://inistor.com/ufiles/files/10652705084.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c783ecbe3e---tubebubirutawitiremoku.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/vujolexujunezejune.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pbhl8m06vvmi19nfe5p7esonqv/25029837843.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/zulozutupoxamoju.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/wafopavizi.pdfIn PDF document text
    • http://veivel.com/userfiles/file/98056888398.pdfIn PDF document text
    • http://canvangdientu.com/images/file/46149859651.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/84552352524.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/76966014244.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161178bd9e2cd4---fadabelidedomanegu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f4d23002---fimaferineluzumanugaraj.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/25r1t8s5jn5qs11jg9q8d2miar/renatipenulonokubukofos.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16f111488---vepuwudikomiponegemef.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaa131587---46470903954.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160879ef381227---zodanedokonutudofiba.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/3848327837.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/49116724808.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b69ecdc1c2---zuzanuvoras.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2bd2d881bed24bf3554b2828f917b9ad/doneto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iphone+how+to+turn+on+screen+recordingPDF 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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 18056 bytes
SHA-256: a8b7e9f15387d0a5bf63125e782eb1260952766c5cf392dff3717ca1d21c92d8
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 10720 bytes
SHA-256: 50b1780b44fa71452e2b525ba3a21d51a3e356d6e54b812243b48124bec24310
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1