Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8a7c168c492bc0…

MALICIOUS

PDF

75.8 KB Created: 2021-09-24 02:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45552c37acf4d9413c4d7bad81e079ce SHA-1: 0174a7fce7c4307fa6c6ee85f7cf943c1ec98e7b SHA-256: da8a7c168c492bc0de86110838d05fd357dce68d37d93019f09f7a736bd14c6d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=helvetica+font+for+android+free PDF link annotation
    • http://canshu.dlzj.net/upload/files/20210911193759433633.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/romevuwitobarodadelalawez.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/12588390760.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614997998df88---15967440890.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d5d6e65ec---pininafomuvigazupuvumuk.pdfIn PDF document text
    • http://lovesenergy.com/file/fufewigimat.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/14819881172.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/papaxevizonopiv.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/sodurenab.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/pakej.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/xebexusuwekutujexegibiraz.pdfIn PDF document text
    • https://regenerateacademy.com/file/91593123369.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vonivasu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/nifoxilopogokofal.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/20265542157.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/93833373474.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f7f00a69f04bfe70e0d8ce726a74e2fd/pubijimusavowozuf.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161334eb815104---63830462520.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/mazas.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/levoxifotuzujukofugob.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210916212532.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/22518779499.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/zupufetupoleroperiwiv.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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 16904 bytes
SHA-256: bd238155b8b6adf7b80810bc8887625cd3f6c3b7935c05f7af2fd2f97bc8a5af
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10356 bytes
SHA-256: 7084dc96cb80e3dfb79c4c09ea1c322805336d5f83ed80a69f37dce01e296b84
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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