Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf4a450444b5ecf…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 18:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b768562e045c0e2f5ba0951deee03c5a SHA-1: 2810a499649b2aea88aaf370031264805fc3c2f4 SHA-256: 5bf4a450444b5ecfdbc54e6a1c3bb420243c6120a6f6d69cefd0a2fda939db3e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://eventpro-kontraktorpameran.com/uploaded/files/6858269071.pdf In PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/xorexoxetugavexebowizun.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7a6ba55b8487e9ca7ddd5f8ba25c261e/wowutemenagoxuxunes.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3mhvcdsrsv2gr3t6i2dtcueoo1/14251445552.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/29345865560.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zajemodenebesojezoka.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111c7a02f37e---24495109520.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/wivefalepen.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/wasudisopod.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/binovikafubi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedde01fde---kimilodapufezelexumofi.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/jevopepoxovalekadazuput.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e5a4e5a7ffc70ecd2745669d6e91d9f6/23712380682.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c02c732cf---52743786898.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/210f274209e10e17a49775848b0c1aac/98328783508.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/18309595321.pdfIn PDF document text
    • http://mintowncoffee.net/uploads/images/files/satazefuruserakiposurifo.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/jidafirunesopasam.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/fitomaxewojemeliloma.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087432411d95---mupebirumeniguwaxezevegu.pdfIn PDF document text
    • https://angkalaris.com/contents//files/zumarowa.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62c5901e9e70203fb4cb8a8d5a19bded/desefuvonogonazebewepi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081e071b8472---83813427730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=operations+management+stevenson+11th+edition+pdfPDF 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_off0000bc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9E 16916 bytes
SHA-256: b6795cee78d02edcade3fb5b41a9724c23a6bd69d3478f8cebc93f91bc684731
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 11040 bytes
SHA-256: 381bb88f5d75962392fedfc6179064ee9a7f17ce4cc8625ada993f38c0a20258