Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f14badc440c5830…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 23:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f83284bac14b52d54aaca59f690f58ae SHA-1: 87be8ea810c386430b56ff36655c4e8491f9dd5e SHA-256: 7f14badc440c58309db2c8b888962007f550e58b45bdcfa3f1184865066a9b45
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. Heuristics indicate it's a link farm on disposable hosting and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. No scripts were extracted, but the structure and URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/e40a1b2607a655b2f7d6be22b370f504/lewozezifi.pdf In PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/94084124456.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/dbe40b27d35cfec68c2652c8ca8bff79/52958653166.pdfIn PDF document text
    • http://casaalu.com/luutru/files/38666431548.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/nunurul.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qqf5b1qqp3n3ugpghkjrsqipt8/denijaresojutipuruxox.pdfIn PDF document text
    • https://ptogel2.com/contents//files/90999003705.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/jobetoromevefuxinib.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba73e7558---faril.pdfIn PDF document text
    • http://willbramephotography.com/87882935351.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210810105822_idyhri.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2f5238d1---56860772745.pdfIn PDF document text
    • https://network-italia.it/file/2781163987.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/66811149544.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/wixosobefomurenexavopi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/11d18967e69a97458ca9ee86255d8e2a/duvelatukobukelej.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607766d860a51---63165662024.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c52fc6d836d---77408566864.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/76757269777.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606e5cb99a235---50465776148.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f02e9daaec8---32157125280.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/69897092051.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hgdsu0krs57bl597h1gnpkf1m7/tilekenoborewesidadug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=biscuit+recipe+with+aunt+jemima+pancake+mixPDF 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_off0000c554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC554 11036 bytes
SHA-256: 0bd87c08b35d226fba5ea73b45426654fc86e045c3ce7300291eac0ea7b0a5be
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 17728 bytes
SHA-256: f190043d56ce445af02ac9d6aa1138f636b49010dc50bccd254281dca69a552a

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