Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3df531dd309a41…

MALICIOUS

PDF

91.2 KB Created: 2021-06-27 23:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d44a762d52593cb7af4513771bfb8adc SHA-1: 331c4e0be57ec333b1c15ecf0a13a3d21ac2aa15 SHA-256: 8d3df531dd309a41b1a6a24c7b1fcedea8ad576020a86fea739eb722a733268e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics and URLs reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://queure.ru/uplcv?utm_term=excercises+to+lose+body+fat PDF link annotation
    • http://goref.ru/files/file/tabirituduteganudibud.pdfIn PDF document text
    • https://termofriz.rs//files/49648140229.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jewuxurepalejova.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/bogewemo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6dfd1c3c68e7cb20aee8fc68e8eb5357/xulenilevamotefinibatipub.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06b3a369b---fovepimaworanovuninosonek.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/472267758.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/60257810956.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0a729784a928f937d0bf9d13830f37fc/jedanuzarepoxarise.pdfIn PDF document text
    • http://amdind.com/userfiles/file/teteza.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/xabuzatakevifavowed.pdfIn PDF document text
    • http://ridendo.cz/files/file/vaxabimavuvifojikegivaga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6732ef228f---jasabinokesegukasogeti.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160768bbb0f655---77529230806.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea93939cd---51166571983.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b035dd14bbe4d5183d936a9d3e2322c2/jawigotojodajuxotufabo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/unecuiflqpbk0m7bfej6ba9abm/27643277538.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d65cc2511---bizafugavanopuri.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/xovekevinezomide.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/88988649106.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/fikilexojodola.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bqq7sfp0iikksir7jqgv1a4gkj/61954449756.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/718dfe26b7483c02d33c9a70114ecb61/wesenudapunogijakukul.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e02599620---tivigizefewe.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bpcv5g6v721ief2k7e0qa8n86q/wobujogizowejinaza.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_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10704 bytes
SHA-256: b61d465f955dfa9c45743f8440d36addc3b746e4477fe2f2066a118cc75af951
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 17384 bytes
SHA-256: 3ce4a28ba117fe9a0df92f6260e51b063346af87b726ac8ff000329d41fc9d25
font_02_sfnt_off00014776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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