Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd996951942ff13e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 08:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 368627280c0e4086f74c677dac55e595 SHA-1: bb032b0c31e53d57a709e37305f84df312679e69 SHA-256: cd996951942ff13ef4583cf810d3609b2c3bad0f6125cbeff0a698c23fc88d2c
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 potentially compromised or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://cructi.ru/uplcv?utm_term=manual+pitching+machine+canada PDF link annotation
    • http://dtcguild.org/clients/80367/File/87734998901.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/repurojiravol.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fexokega.pdfIn PDF document text
    • http://51www.org/uploadfile/file/54f0477e65434eaa208070ad59050650.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/joviletavo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/33167529687.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/94379673040.pdfIn PDF document text
    • http://c-amc.com/upload/files/45228319029.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/sopapilipa.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/60728645454.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/mikikitokugiti.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bf909139dd6---32410273640.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sa5h3g3l2gnbmbte9fq8upi3lp/22999503174.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/tovirikilerufopufeja.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/rekizufoduwuzezusezet.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860454ce4be---nivoxatediredikiligesoxej.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lasif.pdfIn PDF document text
    • https://argumentua.com/i/file/xiwasetibezemegiser.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/fumotuluzeselerisajobez.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/86752856450.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/88372971401.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_off0000c423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC423 10668 bytes
SHA-256: 96c5a5497916c4d727be76beaa1ae0ea65f8778f846d8671cc4053147b089d8a
font_01_sfnt_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 18228 bytes
SHA-256: 6ad2f87c52d58ad2f6d04fb20fbff29e9b4c4c369d3ef6991b6e40aa249f4ace
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1