Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8e8b6cb8d538ad…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 08:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3a6b1500a26993b6f07c900973d5ed0 SHA-1: 9bfbdd1924f9eea6c52f286bd4df3031c3093e38 SHA-256: 0b8e8b6cb8d538ad291b31e8dbd73132fd0a74c8c92bd8734c732f7f4fec9603
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting, suggesting an attempt to obscure malicious activity. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://nomylo.ru/uplcv?utm_term=motorola+symbol+li4278+pdf PDF link annotation
    • http://evola.it/userfiles/files/8208617170.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nojiko.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/zinomojexan.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2kmulcd9rab8a6dvuqltp6u9j0/suwipuviremolafesofom.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/4530347206.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/linumikezejim.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea06d3a13---duburone.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/75673331258.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/13464027546.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/14964465482.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/69778939651.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/81339546187.pdfIn PDF document text
    • http://benly-carson.com/product/files/40503817084.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/bidezebifafiguduwivex.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb67e3f5f---98520710270.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/23219650580.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec4a42c002---52114262213.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/90697425653.pdfIn PDF document text
    • http://chpcentre.com/files/file/26594074844.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cb00e45a4---81303815781.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/828faafbd3c6a49e88d63e7e2b551834/84127161881.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/418ea0c2df2827468b447800f0f3292e/wozozukax.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/96083168905.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/17e2d89b1ce1174197df2246b919297a/33379050387.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/35154435437.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/riwezo.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f654202a26---vidagemijodevuxomotu.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_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 11128 bytes
SHA-256: 5d209b066160804a97c9d35236be809c0bf722796d904c5294b1565d334f4ec9
font_01_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 18596 bytes
SHA-256: 929028321436e84bccd2d5ce5abb940506753807c049cee9180344151a51586a
font_02_sfnt_off00013c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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