Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb1c243957f4d15…

MALICIOUS

PDF

108.6 KB Created: 2021-07-27 03:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f44f081f469a5c91e5c3ee445e235e94 SHA-1: 4c39f9eadc962129b8214332cbb6a2dc4193912d SHA-256: 9eb1c243957f4d153893c8a75bc52c9b6ca387b18a4813ee460145a65ca73551
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample, but the presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://egf.tw/test2/images/file/fofelurupaborux.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbc0980dd---61750305660.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/63671238332.pdfIn PDF document text
    • http://jngf.cn/files/file/welexofewokowizi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d77d8a7fc74---konubajidadojiri.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/datogigaxowozusewebakixi.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210610_160601.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/51602957251.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/zoxadaxat.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/80190172619.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075532e44fda---33646185450.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfqplc0i4avvok3q9scnq7gss5/92525800161.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076aecab257c---ronimibexiji.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/82625849125.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985806a322d---goxowagamiki.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072007d4964c---fivevunibipezelagemif.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/444f0c11997aca9392365b3075ad5f9d/62323805223.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/56224649276.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/wobulowinutomididasifu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/xilarixiwikitafobudobamav.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wezirunixado.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/54089335058.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/susazero.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099987b56266---18275631421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+reset+pioneer+avh-x2700bsPDF 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_off0001457c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457C 17284 bytes
SHA-256: e31f04f59323dc0b8e055f0f92a9f9d8163b96482f22bca8c8850566080d3028
font_01_sfnt_off000172d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AEF 11012 bytes
SHA-256: 8e372bb1a52d0e6b6a667dccca1a377a749093e0c87999987c518e381831a4ec