Malicious PDF — malware analysis report

Static analysis result for SHA-256 b456606a963ec0b5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 16:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3ca05383da3fe899b7a88f86bdff2c0 SHA-1: d3f3ee04116130f9ceaf564d5bb3425141c1ed30 SHA-256: b456606a963ec0b503623188d8e9f56127631aa193481cda9b2133aef0c42fb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the exact payload or purpose beyond linking is unclear.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://ahkjt.com/upfile/file/9917129871.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/ruxuratijifopoxudase.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/54911560638.pdf
    • http://webspace.mysdam.net/images/newsletter/files/81087200761.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/wifidonulod.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c67419142---volako.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e54a960821ef526f68ca95d9153bf76d/49258374572.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140712927cd4---sixifam.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2ba5ee11---tibijowupuv.pdf
    • http://liceoadultos.juniorcollege.cl/userfiles/files/73991251967.pdf
    • http://mamtomchabahai.com/uploads/files/files/8100900059.pdf
    • https://rmp-traueranzeigen.de/cms/files/boxanusawunokowufed.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145db7dcb714---27716048680.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/16349474383.pdf
    • http://murielbellhomes.com/userfiles/files/jolarugikegolifap.pdf
    • https://tekdalyapi.com/upload/ckfinder/files/keloxerubuzuvokigus.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/kewiwifu.pdf
    • http://gardatrans.com/content/Files/wazunu.pdf
    • http://borisovhlebprom.by/var/upload/file/99179479327.pdf
    • http://nceed.kr/pds/userfiles/files/ronawivarefalije.pdf
    • http://nova-auto.com/upload/74352166455.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=coc+private+server+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00f.bin
f65cad67180b984bb6b1781f11470145a140345a1742a3dbab9a86d431470bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 15324 bytes
font_01_sfnt_off0000d6eb.bin
b778fd58cee76d6137471cf17db976884ce9c1d195b5806cf147515095d5f437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10508 bytes
font_02_sfnt_off0000ef0f.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 16448 bytes
font_03_sfnt_off000105e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 16792 bytes

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