Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddda9a1b54073df0…

MALICIOUS

PDF

90.2 KB Created: 2021-08-25 05:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f29c13a3318437abe2939629d5496c72 SHA-1: b58de6fc87f73832e8e99e47d565e153149f758e SHA-256: ddda9a1b54073df0ffafae5820b74ee17c990b705a50a6225256a7f8992d84ab
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://eingangrad.ch/userfiles/files/gijazoliwuza.pdf In PDF document text
    • http://bioident.pl/photos_fck/file/16835555272.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ecf5ee412d8f067eabe8fc7a5687697c/75219599708.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca718a00d9---60720885784.pdfIn PDF document text
    • https://aneri12.eu/res/file/91866879260.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cq1rv038nkuvvcihl1pmc9va9v/37486403049.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/69652281114.pdfIn PDF document text
    • http://servmed.net/userfiles/file/84717107335.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/vuwebexow.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/30005352576.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/6062210691.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/sagatexu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/dunivusanidedax.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0bb198b9---nefutugelodusewisu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bf7099a44b6ea95872944b8a4080743d/27727129338.pdfIn PDF document text
    • http://guowangcable.com/d/files/24081056137.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/bidovixufitini.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092f63d227a0---32109826145.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/37165965163.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/60843959117.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lusokokotesemaziw.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/38218129938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=100+science+experiments+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_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 16204 bytes
SHA-256: fa5ab8bdc6c1b5e56d3ec645c05c0070091ccb11f34e1d8c6667012139ca474d
font_02_sfnt_off000141e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E3 10632 bytes
SHA-256: b835d80b3345e72e02be31e12cf5eb9ac50b1e38a152593a1d0c4afe6bf461ac

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