Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fbd9c3101134fd…

MALICIOUS

PDF

90.9 KB Created: 2021-08-25 14:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a83abe0852c0b994bcabdd6d5e19c417 SHA-1: 1ad43aae27ef0394d423838b576ef658ad6d0b6a SHA-256: d9fbd9c3101134fd20eae1a867371af0d2d0e45ee25e91bcc735d6428bf7aa43
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. These links likely serve as a lure to download further malicious content, potentially exploiting the user's interest in the 'dragon ball z' search term found in one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad354da65d3---sevirev.pdf In PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/53070737454.pdfIn PDF document text
    • https://digireg.com/upload/suwerabupaletutevotetema.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/nudegenazetotibipiwurowud.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/ajqg8o2l7v20boqa7g2n5g7dg5/6696128817.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lutosoredikezipoposila.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/86543258289.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/sodebofik.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d0d78a8815de86cb89511da525f3a761/4502096954.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/65720349754.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/nid8hh09f4u6j3of4n4ta6v12o/jifuvisopotaku.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/gamodokaraziwazosiga.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/temavod.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecdbaaa4a3---98519272800.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa708cdfd3---femafilofebikijalig.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/683504d5ab6941daf6ac07c67f04a665/47013049280.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tt48sm85v7dpl820rmbodasoic/zasozozavepaz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/50236254350.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/20881251452.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/25752286311.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vinofufosuz.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/kizuludelatu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/nasulexisokibiguworupe.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/vedesodaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dragon+ball+z+battle+of+z+download+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10648 bytes
SHA-256: 3f8ed7d68807e06b7a6d9d69ad4a3f68a8e5f4bee6dba67f00012d20a7073625
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 17144 bytes
SHA-256: abe1318275b9c5d289a3c853fe02fe790cf1e32d97891a755fbd915a55de60b7
font_02_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B9 16248 bytes
SHA-256: 6c7e1b754cf38ee70ad76cb780c90d71dc4ff6fc3e14eab78a91c98fc4406452

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