Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b7556a9dbdff60…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 00:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a9bd3613236802afd1cd7146f7cc672 SHA-1: 4c241fe12ee1bce4e639fcb68f1e64167c12eeb3 SHA-256: 12b7556a9dbdff6076468095ac9702b3a20c893ef5f4433aff1338368b469c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, specifically a WordPress plugin. The embedded URLs, while numerous, primarily lead to unknown or potentially compromised domains, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda9c47e61---tuwologilajubali.pdf In PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/fotaxonigikaponubolalek.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/mowuzoxevuwutato.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wunubijepota.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/38668240444.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/tofokuvevop.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021771915537812.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/10656861779.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/79038048407.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/97925171575.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/xesexatowotafemowududej.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/73537705425.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/ziwisigug.pdfIn PDF document text
    • http://xsteelstock.com/d/files/guvowibilaneful.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/30531022376.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/af9f4f0617e008524cfe6c52c539238c/bawunedojikikexogiril.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/raruto.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/75999564952.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/42293631252.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/78403064773.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/xefefexerafineku.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161284007005b8---99477359930.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/89452431973.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/54209399271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=telangana+udyamam+songs+in+telugu+pdfPDF 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_off0000ba66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA66 10920 bytes
SHA-256: 59803d03acf85654578ae26d98355c6ad276f5ad399d059ba6f9cf8fd32fcb86
font_01_sfnt_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 17028 bytes
SHA-256: 1360528133e57b3a3358b532bc21524198558932f5278a8b8a975c49c38c1dca