Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41932281cc825d1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 17:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52e3365ad325113657c31924fe39b9f5 SHA-1: db6ba8090673a344502796916f732461de99c250 SHA-256: b41932281cc825d1b24fa8030fac8440601aadceb2db737ee6f26ad2a103dae3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=maurya+administration+pdf PDF link annotation
    • http://domholidays.com/userfiles/file/xiroduwa.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/89293952489.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/97730197200.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/54851192555.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/vuzorikijiw.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/mebevodazimuwozebu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbb650412---39786451212.pdfPDF link annotation
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fomelosoj.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078f527514f1---jonatulaniwa.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/60713472030.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mopex.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/04a1ac65e9b68b06a39d9dc56163b8bc/99324552039.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/nidimegajivopuzininof.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a6c92f1882f9464f00989e9b1b8c1ddb/55088807198.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/migutajovupavejowu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2hoh1i6l8jflj3plkguskpavv6/73552708458.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46c10fbfd---83753209302.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dce30d653b87df5e2275d9bdeab3c9b6/64877366460.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bd93a936---tekirojizuzabe.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pjcn7dbcd31a5qs5rqf4retkb7/43585486525.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/35720685612.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/kutitox.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/pinag.pdfIn PDF document text
    • http://pk.mo/userfiles/file/45733964570.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/pomaneruxawazado.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9999bd5b---jubofivusiz.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/93a8506b6bdfd0e87aa3c716458e88e5/6763220042.pdfIn PDF document text
    • 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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 17132 bytes
SHA-256: 9cdf628c5d389b9bc319006f658ad0599115feddf7fe828809ee5c22b6344f65
font_01_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 10688 bytes
SHA-256: 2f4cc90482003612099e75df479e06c3fd268a616f370893ee26f64a766eb01e
font_02_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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