Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d44adb26156cfa…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 09:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e77e67f1125baabc6fe23c700545a6fb SHA-1: 7a694fbd8ade077e49158cfbf034fa6eced09ce3 SHA-256: 19d44adb26156cfabc9d14e786e776face3fe71dd7cc5c341c2a624858c1e770
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malware or conduct phishing. The presence of embedded JavaScript and the nature of the URLs strongly suggest an attempt to exploit vulnerabilities or trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=ispoofer+download+iphone PDF link annotation
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1a707dd4fe6a72d79a9c33ab0a99250f/jidufawekuvudubi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9e5e8766---butamoxev.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/54633765672.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/jagig.pdfIn PDF document text
    • https://ksboutlet.com/file/files/38243922028.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/44145887507.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/36645470344.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/furowarom.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/45899629512.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/levagonosuwabozegika.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee00fe2388---20452901963.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pekadol.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/20036897829.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/86720600260.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/gifomopigogiserasolajom.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133807188cf0---4934859286.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/wepezudegiluxusukek.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/tixedatidasil.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/87694127695.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/95802825166.pdfIn PDF document text
    • http://imaginove.eu/data/Files/95197356853.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/32249356498.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/46550333114.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/zelubaget.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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10536 bytes
SHA-256: 8b634ba6ec5c2cdf5550fef042c9de1d875b614c691bc7d81ca585746aed67eb
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 18280 bytes
SHA-256: 54d886a5692e5274e801377f3457c839103ef71f87fb476f789ce2a39abb0bbe
font_02_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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