Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3b2110dc44d37a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 16:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc41203be87477278c933f38b57c2335 SHA-1: 06704cfaf9fdeb608c2bec8064e81d660028e858 SHA-256: 9a3b2110dc44d37a0792671402bc02a5a323120fe611756ce4b2d119e18143b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. The embedded JavaScript stream and ClamAV detection further support its malicious nature. The primary goal appears to be redirecting users through a series of links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=the+professional+practice+of+teaching+4th+edition+pdf PDF link annotation
    • http://mundori.com/js/ckfinder/userfiles/files/68269591119.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/43187730454.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/foripumag.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/58862424819.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a1e722cd0---filiziv.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/posilis.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/wineled.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/39907829a157b2efcfabd1c01655bc4a/xabumam.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/42631858137.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/10919364387568549d4aba5988326d7d/koxadivoge.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/zopawi.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/tiweg.pdfIn PDF document text
    • http://suurelepa.ee/data/file/86664530626.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/skfp4cguaa5unfuhcasaiphl18/22657336420.pdfIn PDF document text
    • http://juncheng.tw/upload/files/9957412469.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/dukiruviludira.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/99975871677.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f6ea11ec---50268438447.pdfIn PDF document text
    • http://qdjshg.com/files/file/serovokatilijofevikadi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/3428543317.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/40332957433.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/51271035764.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wezemagepak.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16bd3a885e---58840495767.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

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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 10940 bytes
SHA-256: 9918e3055417081760b866bc9a600027e4923a88a231fc8ab7bd836ec5f569fe
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 18304 bytes
SHA-256: 4993e72df0e9d3235256ad88452959f79450b2c62229c4248afb4c8e3063b1ed
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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