Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf6549acd52b4db…

MALICIOUS

PDF

121.2 KB Created: 2021-06-24 17:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 86735601989f081fce7adfd5895ef7db SHA-1: 1ba730493e38f06abf8487fed82d14475ce0f645 SHA-256: 9cf6549acd52b4db0e1e993f3896d012bf9bccf5df6ab4ac587c12ec60348efc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file exhibits characteristics of a malicious PDF, including malformed streams and numerous links to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://oniceh.ru/uplcv?utm_term=class+7+cre+notes+pdf PDF link annotation
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6ad8774f9---68542562939.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/zevemabobepu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c6738747856a2993d9d2d2caa0b1bad1/xakelilajasisimawazovi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/708ad0j4t3ac6c48r6kvosgtei/mujapizunesazegodobad.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1c4c7fb4---51091990.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/datosomepez.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/14925832410.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/o06j4bek3f0d4265rvhk008kio/tizuruno.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/sofuwumabefipekemunojed.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/69068218788.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/65897953397.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c78b3167---96902778202.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/xibexugetenuxobar.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/510f4d2c8fe1b8a9ec7104284823b707/42883987051.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc0a6e87b---dewufidunumejidivikuziza.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44ba1cd55---rasebojuwiga.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074adc91ff43---jarutasod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19142 4992 bytes
SHA-256: 022522c4ac39d46023eb07a654e07bb8c3f58d08fa2ecfab765f307f718347e0
font_01_sfnt_off0001a24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24E 11416 bytes
SHA-256: 045ea7822d39d4b9ae1155d2c3dcb6d0550338ad89f8780fdc1d8878c1153028
font_02_sfnt_off0001c91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C91C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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