Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ee5cad94862578…

MALICIOUS

PDF

88.3 KB Created: 2021-07-25 07:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64f1fc7491665daaa4382494fadf1b82 SHA-1: 55ddde93f1400f5866371f2082751542e15443ad SHA-256: 17ee5cad94862578682f667cb5e5998e0b7d1bb6c98bc7dd93f83870596234dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or SEO poisoning attempts, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cedadc86d---39690102651.pdf In PDF document text
    • http://cecev.com/stockages/files/87632232243.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/29d998e520c3a0d30e47bd12551bca03/fuzijizime.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210611111132.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/vozaliriravi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae982a765---bexesowoluraf.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nigef.pdfIn PDF document text
    • https://5uempat.com/contents//files/dowefonegapexod.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/21979026162.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/24096766041.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/u6tk215mcg2vf2keffg2iqftrn/61946783099.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/62681650630.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe253871b---muponuwegil.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/babiturilamote.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/vemupurizopefub.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f5caaeb7011127d2bc25f1d9c2b07a8/mamusigasom.pdfIn PDF document text
    • http://goref.ru/files/file/pefibobon.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/38553932688.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/pekuwo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/59c0d5a82725e0c044dd73d01ae6b929/dusulopazo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160add918905f6---13522628022.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/54284222938.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f7ec3576---97833160035.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c390010e070---82615823073.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7620786505---runenujilagiwonawekofusix.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/22734240438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gps+essentials+android+manual+pdfPDF 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_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10796 bytes
SHA-256: e89355b101a82f6771d027be9a6e7fba24c556895ea0227b75c8616d8cbcd21d
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 17280 bytes
SHA-256: 521c770aff0675b50f6ffa25d2dd455fb31bcba8ff6f1777ee8b43195ffc704c