Malicious PDF — malware analysis report

Static analysis result for SHA-256 111da637a9d62a67…

MALICIOUS

PDF

84.5 KB Created: 2021-07-05 14:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3e8c146f4f2003f391e41955ebbd4335 SHA-1: 2c6df5bc91ccb8ce3f1a5665bd12ab06e944f870 SHA-256: 111da637a9d62a6709db5da78444059b0b2d55e50848919c1f6733252c3d60c5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as a phishing trojan, indicates malicious intent. The primary goal appears to be directing users to download further malicious content from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2h1li9e13q8qkq9l8disa4tajr/9726545110.pdf In PDF document text
    • https://tort-art.ru/userfiles/file/numewugepozazitev.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dbd9af56---50011768998.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da67819f86---sekigixoduxemupelasor.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210622_045130.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3b09aa174dfeec759eb16f0591f42da3/40459282329.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a50f0cace0a---94820319137.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/bajunenovuruzatot.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/37226669947.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/sumizagus.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c112910472---76711716210.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/35479590603.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568c06f2de---10450678428.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16075eabaa4f19---55269318487.pdfPDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8685b06b7f3d1bb6c96e024804ab5a4a/mojivenojizikagemodobi.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/95765811048.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/paruxemafowi.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5a4a29420842fe99aff57da7cb96e802/3368910096.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/894c99b73c7bcef52771f92b3df64038/bujifen.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/guduxiwabulikopitetajerus.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/bafurezizibu.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hn1qu5e4nj4mli399g3ua6fbqu/rubojasog.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/34a31e99b8a2c7d648d8df7be794b11b/jifuwoxilaguwoveduzoresi.pdfIn PDF document text
    • https://paperland.bg/uploads/file/balisitazokatavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=disadvantages+of+e+learning+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 17520 bytes
SHA-256: 8e854bc2b2052cfcd05161336e7d8b839c6208c50f46a223d30ba8ff00c3332f
font_01_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 10740 bytes
SHA-256: 8c1c6dfaa047a1abcb7eba72ea656dd5394f2199ae4995a9b29b1f4926459398

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