Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d58ff780ffa756…

MALICIOUS

PDF

88.8 KB Created: 2021-07-16 01:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b1cf14cb9b1d3b951b2e78ccc2e5d7a2 SHA-1: 31571f73a3433553743c341fd2475b207f12ee9e SHA-256: 28d58ff780ffa75624f5c2f3135b249c62e686f7193204f09c9073c6b14109d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is likely responsible for redirecting users to malicious sites such as https://infrive.ru/uplcv?utm_term=principles+of+blue+ocean+strategy+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=principles+of+blue+ocean+strategy+pdf PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c679fad28a---8975573640.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/adqemmahrhtvsasgnhi5cbf99v/92441078133.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f7f90d719bd8c2825f8dd34d0ce71c92/ravalojeposipusopeludupa.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/65810355291.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4ae21eece0eb5cd3a9f8f74c1540fb4d/kabukorojapov.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tinerukifu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/vabivaxafatimer.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bec7999abe3d5c732790c7cb525225d6/70076049983.pdfIn PDF document text
    • https://coil.hk/upload/files/72796279597.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/zisolebupixevajunejexuf.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d257ba1da2f67c2274ce5bcc3676e489/gadonamexis.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ab831e7a---lodularaxixexotuga.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/54811009135.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210625_628DD52449F87DB3.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a283c309054---9809450283.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2634c20e64---38738571299.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48ff723e9f---42564819886.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/riruwexafemowoli.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sufaf.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/nezovibuw.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5b4fff8e325832c9246546f17acc7a85/87112430526.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_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16936 bytes
SHA-256: 61f0fe2af954bd5f523c4139b1a6d0c6963c2d3377f0fcfe61621ce1321340bc
font_01_sfnt_off0001241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 11152 bytes
SHA-256: 5179acfc72240cebe63f1ee341d32908b5b926ab43e6ee1ab3a1e707d709f168
font_02_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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