Malicious PDF — malware analysis report

Static analysis result for SHA-256 9119bd86cf1e9aed…

MALICIOUS

PDF

95.1 KB Created: 2021-06-29 11:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 017c9e603b7699d6d267dcb9e2ada43d SHA-1: b300c6e9f385c01017939f9ad52913c374730204 SHA-256: 9119bd86cf1e9aed818bb701fdabe651ed7715d47cb91b46ad0195cda5ca16e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6929e9e0b1---58713562144.pdf In PDF document text
    • http://sun-eko.eu/files/file/71676353963.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/472b833242f159670d2c571c2651a825/nasegupuxipu.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/38962249397.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/wijuwepatawujesir.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/sokape.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vqovv7gsdr1dl0d73kltgh5uj7/gugemugewipow.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/buwuwojosipobebunipe.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b09446c6dffdea3ec3ff09252328415c/1809501440.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xapiwomifafebawilasikikug.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/3a7nu4uhfce6lu12bub5i96661/27029675811.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/savirokaxolusozupegiw.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/078d81c4d00f57317dfd96287445e398/83938991988.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d06130968---malezabaxik.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/p70q0vp8qqunp513hnesogr5r1/taredimava.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/96007344514.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7acc6a45---1820930218.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/soxegofofimu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/an4bi4er3v57ohebg5pkqjjac1/49064374609.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4951beaa3---88289907741.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160947ca3a88de---didezot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+musket+balls+in+terrariaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 17932 bytes
SHA-256: 65e366dd7c9d22e3c0791a53d9d6d0239bbc530527d18f60666b8fcc091ddb75
font_01_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 10860 bytes
SHA-256: ee05cfb7de3b9d6e22f14bebe23595eeabe119f10e93709696f8e15259a15655
font_02_sfnt_off00014125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15936 16176 bytes
SHA-256: 88ad93e3e248d384a7d1bbbcb97d0fa661b191d0ff29e658657573e9a10af748

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