Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb45b471e5688773…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 14:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39d59547b5b99dbd80ec748ae4d36f49 SHA-1: 22c507880765ecdf05b67a42a23d40ed76daea79 SHA-256: fb45b471e56887738d560db4af50e101d3f03bec2d9ed228d5b28bb5a3ba720f
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 contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of these links strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134deb262391---15456235108.pdf In PDF document text
    • https://birutelorasin.com/contents/files/bifasegexufotimamilokozu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t37h0vhe25b204uu340vjgku60/47132106087.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/goxotaredig.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/xasejeviw.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/78248562811.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913055957.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf2cb6259---zozuxumifodapavi.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/3343033230.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/88138715650.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/38577070341.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a8c692b4835c588e80de004983ceabc2/matilowej.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/wojagalowowevajew.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/toloxefalakawokixuba.pdfIn PDF document text
    • http://progetec.org/userfiles/files/virisifufotuzulibilajudog.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911110915.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161395d6002158---vipodoguxapi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4t1bc477e61de438e3rt6i8sv7/kezorefuputaka.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/kopubuxobosewitada.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161450f688f589---97398520753.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m7mgkdelf9ouh37fouh13o0l8g/35778201489.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/15903144298.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/94910910580.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/72219355321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=3d+parallax+live+wallpaper+apkPDF 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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 10316 bytes
SHA-256: 8a0cab98ac1332566c85222941aba556350988beb489f7f1b512c739b20581ff
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 17448 bytes
SHA-256: 831c4b14f25dea8ff16a3f913dcf6e4d43ad05202ff6db0beeb720f88d71b195

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