Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3d320d82ecf68f…

MALICIOUS

PDF

93.8 KB Created: 2021-09-08 05:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 238ee5447290dc87c64983a1211c95fd SHA-1: 0969b7a98207c5c04ddfea3e2db1d3e1a608b53b SHA-256: 3e3d320d82ecf68f89b1d864a347c66e29bfc7482f51dac3c604b9d4f24d5d46
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.agot.pl/upload/file/4809231118.pdf In PDF document text
    • https://thinkhigh-tech.com/d/files/56375432097.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210827_403778AC08530AB7.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ec563801---15756295237.pdfIn PDF document text
    • https://media-get.com/userfiles/files/13193584031.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702291cfb4---femifukisivun.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/76382406886.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16128e8b9cc5ec---xulazasekuwaruwafevoted.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/23631706732.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1b91cd4a---defifalufomozuderuvakule.pdfIn PDF document text
    • http://salespate.com/userfiles/file/59962355926.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/83476451368.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607330ff7647f---71911130097.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926de41428c---xonitajegula.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b735ce69b44ff30e5d6974f0e5a1def3/tasujo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d92e122f---16088173585.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109060336418813.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/boesnn49u1u8cf2p0tj7aj6q2v/gixigosobatizigunubap.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/48718050501.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/wurijinuxisade.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8f99c37b---55650585392.pdfIn PDF document text
    • https://tavio.ru/files/file/xakipofexenimudo.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106010837011988.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cfd60dde8b6e5ac29158a9438a5b04f6/tubebituxapew.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/58946859849.pdfIn PDF document text
    • http://teknis.it/userfiles/files/93166139581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sequences+practice+worksheet+answer+keyPDF 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_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 11036 bytes
SHA-256: 61f4d93fb82a39b787d3877a4533a3eeefe43bbe08a7d5176d9ccd29162cfb9a
font_01_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 18824 bytes
SHA-256: d7af66c7e6805cadd1fc7f8e2ff9c3c0909fdd4ee5ac0532d36e1abc01340eeb