Malicious PDF — malware analysis report

Static analysis result for SHA-256 5756669c2344d0b1…

MALICIOUS

PDF

91.7 KB Created: 2021-09-07 02:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32552c9f0c31c167f2fe9a3c0abc3639 SHA-1: 81c5bf103cd9947656d4bcf1474fd6d3a818101f SHA-256: 5756669c2344d0b1fcd778490c433db03e4fdd297071a8fd93bc9525d9da84dd
164 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 link farm with numerous URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious payloads or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=synonyms+and+antonyms+worksheets+5th+grade PDF link annotation
    • http://ergo-logo-bamberg.de/userfiles/file/bogobo.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/93148102629.pdfIn PDF document text
    • http://cjatkinson.com/userimages/pifososob.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/julagufejowabebikuwojeze.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/84206972415.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608634f50d636---nekovubomaduruwuvebil.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160955441456a7---12159122599.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rigigewawofemusopisebu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607588d998399---jipitege.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/vexebaxedafobevanare.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/nedoxafo.pdfIn PDF document text
    • https://motoralbini.it/files/file/99235122761.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/7610669651.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a8a313bad42027cd12f6f955aed93d48/70917617486.pdfIn PDF document text
    • http://findusafranchise.com/files/files/50205815307.pdfIn PDF document text
    • http://gyobel.itpublic/file/parulusu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n1fm2sei79c23n9c2gk3dm4edg/detelazan.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/fabulizokamolideseleratud.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4b98b6af4b3056ffe309cd54ea9c16b8/65544827050.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/9509a37af11c4c3c06791e25ec2f9d4f/bewazepegigibuzu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/687de306e04526bdffddeda904f93233/woditaxanemanusavoga.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/pazixopukubigetulofabiza.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_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 17408 bytes
SHA-256: 6770420553c465da1b91776aae02cc97cbf30a2cb81677a0befc2673d7c6d99b
font_02_sfnt_off00014760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14760 11060 bytes
SHA-256: e5863866d0c1333e162aca0cf9f11cd3b14687a14bf92feb575ff8871685ee10

Open this report in the interactive analyzer, or submit your own file for analysis.