Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8391e5974bdadd9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 03:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 534f8a58f64ca784a5937ffe66dba4a1 SHA-1: ee34ac2c58feb863e0813200c7bdfc1fb4f18662 SHA-256: d8391e5974bdadd9f2e0b71e9c0060cafafda89c855095b4ed96e8c5239ffe64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and numerous external links are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://byty-pardubice.eu/UserFiles/File/fiwabetasidofelojogavi.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6bea9afb---44249061488.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vebinelo.pdfIn PDF document text
    • http://dhf-china.com/d/files/27849035471.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/0pqgjjkgvvjl53ndh00birqnfg/42596903522.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/7362273773.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/wumipojatejekise.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2198a5b98f---lunudewodovupapukotus.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/psrs243e5snpnv57t6f2i2v2p1/88921286628.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ajufjo7td68obu5hhdtjh86hku/18778430218.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/xezalefebofu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f6e304b0a2e53de73dd483d5d1fbc3cd/71923365933.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8b67f895a500eb10132d89216ebfa4c1/nevegefatoxukituvovame.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/givilasupimuwedapenape.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/betebugamajugo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a56f078375043bd71a4bbae0545db191/18638675224.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/linexujivetibokapaxe.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/79450517832.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67e0b9342---86246445099.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/29419584942.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9ecb91041ef10d16b0853b079f706576/95695376716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=spanish+words+that+have+rrPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 14940 bytes
SHA-256: 00e684655ec80a5f991a7f8c46958da0ab55bbcf1f00dde9fb632d1663ee49cb
font_01_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10672 bytes
SHA-256: 3f8e95514df6b5cc712b5d5ef1bcc218b06e176269c44bb35079a969224d1f62

Open this report in the interactive analyzer, or submit your own file for analysis.