Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8baf755b22cd46…

MALICIOUS

PDF

83.3 KB Created: 2021-08-17 01:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fb335bb3e57f9fc7cffd78fdb3916bf SHA-1: 007d670009b2eb0938cca62dd2868499f0bdaefe SHA-256: 5f8baf755b22cd4669a28da07525e7d32ddad54389f465f8823c65e3b7543ab5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=clickteam+fusion+2.5+full+version+free+download PDF link annotation
    • http://locthanhroyal.com/upload/files/7746256258.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5ce754b639db4b8e6ce4e53ae8aeb8b7/80300722904.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/vokob.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/22746798875.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/80354302281.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/16574770591.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bda35e44d6836fcfff8e9638e6dc5910/gidagigavavo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609710f4f196b---67130195210.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/89077338552.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6ccf3c65---40797019301.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/727fbace44d7ee40d0c6956be26857c0/suzim.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eaa2dbdba4d9fae9e6dc9e592ee50ff1/ladebokid.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160969cccd7990---24162791301.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/kapebegizigus.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/999013e4aaf98fc5d6da74899fcc56f8/35271706581.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/gulorewubegipiwuxesoxebom.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/38484131356.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/63385387324.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/18596841285.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080206383624.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5cfa7ac0babf3bd81b1bfbcea3971ddf/petotaviji.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/16909780331.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/18985777597.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505074704987396.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5b52683c8ac2aa20b318249fafeeb7db/90284802419.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_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 16852 bytes
SHA-256: fe97e8cd2e486535407f0dbeeeecd5a5ce907750d8c70521bddf1861c4dc4448
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 11332 bytes
SHA-256: a9933396f426675c03958d5c19888b23b2055aac613b045b7e98914fc3773df1