Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1f79f4aaa23c09…

MALICIOUS

PDF

79.2 KB Created: 2021-08-28 04:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8403d9dc6cad5cf6e58fb7572bfcaf00 SHA-1: ca5ffd7d24bd5d048ddf18cd770d8173b520f9aa SHA-256: 9f1f79f4aaa23c0981dfa03f15961c37e50cdcda118953eee233e53dbaa9bfee
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting it is used as a link farm to redirect users to malicious content. The presence of multiple external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://huntic.ru/uplcv?utm_term=compress+components+with+gzip PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db590d17e2---nutagedesi.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/30549451638.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/xirapijasamuzisutufi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a771d83df4---ligalugapekapojulala.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/94122356303.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8f9b736e---zumaxazaxawidemo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079014e363f9---49459096408.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/51166075161.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f62202a7f38749ca652ed7accd0aa6d/rimadixoxinal.pdfIn PDF document text
    • http://cmtsport.com/pliki/83027484386.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hopnj3h26pu1eahaunvelvvjc7/gusopiradubudo.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/95333185147.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fcb60e8dd---jefebomefolinopopote.pdfIn PDF document text
    • http://hzqzg.com/d/files/93746685454.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/sezipazuguvudezizosu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02d8867c1---15466299137.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/vunozalis.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/mugojaliloko.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73e3ae63c---bezidesetokozevigife.pdfIn PDF document text
    • https://tavio.ru/files/file/guxuworiradosipini.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zagadunaxepovegogazifusir.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/bijezaxe.pdfIn PDF document text
    • http://aimic.com/userfiles/file/67190282924.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e714be3cee---30123140750.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/kuwetaxiwiko.pdfIn PDF document text
    • 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_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 19984 bytes
SHA-256: 5615fc83f50f90653f12f1089b3c74251627270249a03c795d643b1058cc040e
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10788 bytes
SHA-256: 62b9796a34037f49f00a3443d71bd3b1f557922c68f29d488846953d4fa7996a

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