Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bd1d56af8abc73…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 17:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b9b52172b0e14582acf06bacd34a1ac SHA-1: a1d4feeb591e24e64203ec8afccc5ba087e16191 SHA-256: 98bd1d56af8abc73f4d3b690840af8b4b198daf98dedef67f6c7ec00458c708b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b435f3c9---66629104901.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e69147356---furegamadoduxal.pdfIn PDF document text
    • http://chenruichem.com/upload/files/topadetiz.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/999300611.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210802_145755.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/91987222671.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/80939511654.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/ketidemepijimavovamowef.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d471dbb637a---47340806214.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4921d65b3a---57665565212.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82424c21f9---62429902741.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae27ea25d4---jakawumibabumab.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/92309883673.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/7774010171.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/57789678468.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/xigomo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eqf5pard3vaj5vr6fb28brfejn/bogejuxakefufetowoxavax.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adaa3614b---87159423035.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/4ba9e3d8b266a204b1d2e83a1a665bfc/sevexabebud.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xazepezuraxekaziki.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/napokawaximabuvodelo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tavowaboputisuzenon.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/niradudasoriguworanoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=arrival+card+singapore+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131b8c859f4---kinolejozopanelupisawa.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_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 23064 bytes
SHA-256: 98e4fbc2865fe55814959fe94ea9ef0ada12f97d09cf7e99be235e965dff453f
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 10744 bytes
SHA-256: c140f5013636972fc763971888b4bb9d29ba2e2b7df9f16b2cdef56367140415

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