Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d1f6f110576245…

MALICIOUS

PDF

118.0 KB Created: 2021-09-05 06:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6109a682ac1058d62a3acd04b4dd330c SHA-1: 97898ad797bdb53139ba05a52999ce97058cd2e6 SHA-256: 82d1f6f11057624585bc4ae67db13a6d3d402edeade29705a2bff266e1583c70
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are identified as compromised CMS uploads. These links likely serve as a distribution mechanism for further malicious content, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://yunnanyingxiang.com/ckfinder/userfiles/files/78525303590.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cc9b114de94d02cd95f85791c44c77b5/24784327854.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/0cac67843dde1d862f0cd46e65a611e7/vuvitijalugiduvunev.pdfIn PDF document text
    • http://charontrade.hu/data/file/fuwifipo.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/35879047242.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/83355523920.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nitug.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/23931411946.pdfIn PDF document text
    • http://lactopad.com/uploads/files/fujuvomezoguwoxofej.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/40599737687.pdfIn PDF document text
    • http://unseretochter.com/images/file/rogobuvipazavinapisot.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b087136e1---tenabimewulis.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/zodotezasit.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/vaguninevamupe.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/dudusinir.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/xovimezotuferesebozijexu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2ec66cbcb---lefujiruv.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/622ce99c0417e68f5992033dc71dce77/denolewevajeneretidudake.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/kebuwedexenezimonu.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/nobijuwokefafefuban.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/87975273048.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/povojozisitenij.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160853cc84e5a2---fubexosifipufutadol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sony+bravia+tv+manual+2012PDF 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_off00016b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000183a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A3 17672 bytes
SHA-256: 180b760e7f84096ac864a9ec243288dc6aead81705fef93f7c23f4bd29fc185d
font_02_sfnt_off0001b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1B5 10760 bytes
SHA-256: 816562e073b00d53e11b9fb3a238ee5231c001deccaa4a3a178fc0c08b20b810