Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fa1c9f5f3ea86b…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 15:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7d2b0313f6c0001305e2f147906f7174 SHA-1: 56fefc8b4cc2b086ec3d62512cf5a8d643fc0355 SHA-256: a9fa1c9f5f3ea86ba927a8ac13066b5d7ab56d2a2dee9249273247bd1b8c2d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8f758fae4d908875ac78cbaec0438d4f/jexafolomaranaki.pdf In PDF document text
    • http://lucann.com/Upload/file/tonerikupalabana.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d93880a---lokigobobi.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/56702795120.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/3207393198.pdfIn PDF document text
    • http://apvn.info/userfiles/file/buxejebola.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/32665677102.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bueing6hrbrgsjlngfnjsj4065/32061744085.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/gawukasaxunoj.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d72166eab25---tupaguwodixiregife.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/nozowoxedoge.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ddc1e213feb4ced1d9c1196e64f739d0/refiduxakipokewij.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/48536872541.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbe3cdff1a---tosibabaseliwozidoji.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/suxobukumusunajabi.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9a94912e---40220665698.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4961f9773aad29b1884afd3afd4202e7/soduziridopava.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f7939fb96---92633701633.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/p2d75bl19b4817jsk38cpmkgkd/6920400487.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/sjfbcb912764drllp007r520c6/lutumovijesenizalanuk.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/vesosusupesas.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3a252b5aa8fdbbfeea337a9a7d46038b/91877897630.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160895d66d1743---javewuzebunadogufujanax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=general+form+of+a+linear+equation+in+two+variablesPDF 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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 17892 bytes
SHA-256: 5df6224a47f7c2523de95b24a7a94163f05179bae6703c4d439574b9d2e06f1c
font_02_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 10952 bytes
SHA-256: 848b4c280ae844ffd7317859a1f39ba05326623b88edf6d616396af9c897d8ed

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