Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb11c819e4d6a55b…

MALICIOUS

PDF

97.1 KB Created: 2021-09-03 18:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16b012e9dcc23b2329aaa89b8c034c34 SHA-1: f417abb98de4a6d1ed503c2e236203f02c71041e SHA-256: bb11c819e4d6a55b025684a1ab078f3b04373156df5a6dd613d1b934a128392c
124 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. This structure is indicative of a phishing or malware distribution campaign, where users are lured to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://salsainkonstanz.de/media/files/navuwifafiv.pdf In PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/donetivonipa.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d73900f45512fade20adbc85bd23d46f/86274888574.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ff024d52---58435792448.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/eaf5ecc0f45134d9319c31ee40c259a3/50018532800.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf235b1dbb---85910433249.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/mafibiwubowepujamowekiv.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210826073626031252w1p6g1u7lhai.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c522ee12c91---21066503277.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fisepiferugigameluda.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d8f844e4---36174699641.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229a58db27---nebopovana.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7d405d29---powekakikevevudode.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39545970768.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/98928251824.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3hv3gdt4fnn9782h5si0l6cf8n/59899152392.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/79ouob7gnihomk89vfro3lq1nv/kasawenifajag.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0508f54d---zosogiwazi.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zigeribunidepadodenebas.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976e37c0c55---97687608392.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/gowawozosedufawazojew.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/juregulimusewetupali.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/nofugavelorufenigonax.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/64852227950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=makita+bench+saw+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15483 18172 bytes
SHA-256: 9ae3f03f1e9c8ab3909bbefc48a88cb273486c5119ca018c4a6b61ddda122b0c