Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4424213aa847b2…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 16:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee7f3bd09c86a46ce84a9d3a25581dee SHA-1: 11da52191d8a4fc29e43a515812a7e3f7012d5ed SHA-256: 7d4424213aa847b25e036ac88d104352e12e210fad52961f317c813e6a64b28d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. These links are structured as a link farm, likely intended to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack pattern being a lure for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607740a3e48df---lojenafevefinuxag.pdf In PDF document text
    • https://hzautomatisering.nl/userfiles/file/55469156196.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6b4c26f3---95484773385.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088290239d7f---38599785368.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/opojp9mnclt8a1g4t9lc4rj1gk/wubakobi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3b04799b---sidurexo.pdfIn PDF document text
    • http://boldogelet.hu/media/fakatometunuju.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nulojeratojulemododuted.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/91255087741.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/79109892395.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/sugumajotezufafijox.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/80725022258.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a6129fe6---18508249327.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5410562e0293b963d98a46ba78f543bd/21467383745.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/gupigub.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/bureniwerako.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/7738251650.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/boxekanobipofos.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/99ff7b97cc9adcf48026f46c63c7f021/19938524374.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/xokagag.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160da8bc1c9f8a---59127021498.pdfIn PDF document text
    • http://laserinnsbruck.com/static/79006791444.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210812_1F59914F31541080.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9feb7b722---65384534955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+download+gta+5+lite+for+androidPDF link annotation
    • 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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10560 bytes
SHA-256: 6af0ac486e15c0211692ba455fd21b212ca12aa6bac7ccf8b2fb16745fa2e133
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 18072 bytes
SHA-256: db49a2efad58545cb12928b25f2d4f293d74ebb000a9681c6cd94570c766f540

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