Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b0302a04b58901…

MALICIOUS

PDF

87.5 KB Created: 2021-07-07 17:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0b19c49e14b24da068c5ffb28f63e08f SHA-1: 59d972de4f69fa26839bef6718e500987c74fbec SHA-256: e9b0302a04b5890189c4737efd29862bad7706c59ee25be4047bb5c8c99e1fa4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://riceart.ir/basefile/files/20727043373.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nijor.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0def79f6f---luwovonupafixirukemav.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084213f21920---51088771759.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/datowupupuwakejekep.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/pipumaralemusaj.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ed9c8110fd3fc7032847664e24cfacfb/vuwemi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b9d752ec---71368830344.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/wetiridebesavu.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c6095ea075e2d69d65623e7191c684df/92665357977.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/liditedinojij.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/72335498277.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/oneg8iq57ig8cvdnv6p46shpjf/80992886749.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071de9d34a48---xasor.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f7b646c3---gabiwosifenibemolokupediv.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720480a9034---7453177473.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/r0sgase64ee917m5e7t5f9gcf4/nuzepobovukero.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210620_131132_3263.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/pefegaxafulezemufe.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/fuvukukukeregikiduzo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/a083b6c602580fbe9ce933ba88a4d98c/29070224544.pdfIn PDF document text
    • https://actor-conseil.com/files/file/varesutonopudulonagu.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vutupaledimirilozanonex.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fcb5eeb0---55692533493.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/fomiletibev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=magnesium+citrate+bad+for+youPDF 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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 11120 bytes
SHA-256: 04c114ac274de65750d8ecd958aa376ca7f3a292df6bc82c08ff1180834af49e
font_01_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 16848 bytes
SHA-256: 8de69259b1738735b40ee314d143838eb573db4083f49c32ab38f309d1d5d7d9
font_02_sfnt_off000138c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1