Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dcfd9196b57e15…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 10:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d4e686ca767d25823054e674809a6adb SHA-1: 156975a2921da96ff4fd665e5ace947724b091ce SHA-256: 55dcfd9196b57e1530f78231bc51dd6c7b0bb8c291f442c04bf6d002c6ab1606
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=7+day+diet+plan+for+weight+loss+chart PDF link annotation
    • https://activepymes.com/pub/file/67934594710.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/48560750136.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa9d105fd---50957324816.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/91882359623.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n3s7i2vvrrmvqn6serap0c1m54/40342061874.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab401cb79a---kumopari.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2696151da---zewajasuwolowarevilebusaz.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9899e98a7a9bfe02396b71333aa80f96/zodefopa.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/08/file/20210608_024710_117.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/62189355353.pdfIn PDF document text
    • https://rcot.org/userfiles/file/99556562819.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5e2ccacb---93100307608.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b521c517a0c---10180118729.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/er32ealu3etklascebjsjak8lh/zowokonegitum.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/58728528610.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3b6a8b245ca1b035a612ffa97f91ff45/80171357206.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1rtju2jv59p7i6tatsomvris8q/56013948252.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/181530d917a1097b606a28c43007a3ad/nanorore.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/ravesawakitoliwa.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/dafodusumemidukowu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/9030291962.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210702115613_34u6a6.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/5473657396.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/16881373256.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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 11052 bytes
SHA-256: 963ca8835aaabbd66d20ba7c0a1cbb274ba367b52a5a582b2985830d8f957459
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16924 bytes
SHA-256: 398655aa7c688e7cf061536907b39ebc074ddfca7365a9a2c74fd2639cf13215

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