Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9edd35612b36be…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 02:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 652f6857215c5740d5558c4bc73ef294 SHA-1: 8f77b10495a2ceba91c226daadc2c3f41f6d461d SHA-256: ab9edd35612b36be1a71eb9202475ed7751b50b6df447ca7df9d9c4d24357056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://irlanc.ru/uplcv?utm_term=how+to+turn+off+auto+update+on+play+store PDF link annotation
    • http://aeronautike.com/userfiles/file/fivegironover.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/tugopap.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/97878652676.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136475cd7dda---63970526757.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/98ca3cc301195ccae989ff2d2aa5c091/loviruromunozedoda.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/cff4cbed5a39e1a8c4677fccde7ebd40/15521958656.pdfIn PDF document text
    • https://combrooncom.com/contents/files/pezoruguwizukuvalanimul.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/subuxijejegumiwe.pdfIn PDF document text
    • http://taigesw.com/upload/files/19867958512.pdfIn PDF document text
    • http://grotech.in/userfiles/file/79670800207.pdfIn PDF document text
    • http://recviem.ru/img/upload/dezovi.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/jepenelokapuboxerulizegov.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc76d60bb5---66357155158.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/62773813943.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/wifowekagixisudufo.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/32623206344.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/19338442928.pdfIn PDF document text
    • http://mfahk.com/upload/files/52083557087.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lesejuji.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/sugesikijovavifumikumi.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/vasodadizarefibavuwaxi.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/minuzugelomev.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/xesamabixosu.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/51000982253.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/nujijudigewerafuzajowiwa.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/72942537078.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/luxukuvimugonopol.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_off0000c05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 16332 bytes
SHA-256: 8bdf6ac122f4fc1b25e648f94b453e3c096f889730565316512b40315cbb91b2
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 10688 bytes
SHA-256: 0e83e158d1775775d520ed9e688a2d016b72eb8ca73a0d29e10aacc15fd6f492
font_02_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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