Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98a6a518eb89aad…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 02:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26fa56e92f20761c1098cbf0de0bd244 SHA-1: 9f7ab390b5dc200dfd2b5d8f2702e2e71e02b9b2 SHA-256: d98a6a518eb89aad062d772c8f29da4b960f6186b9d885697af928aab1c55e21
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=chandrakanta+novel+in+english+pdf+free+download PDF link annotation
    • http://maivietnamesecotati.com/uploads/files/15485372288.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/vavutisidiwozagenulezepo.pdfIn PDF document text
    • https://alev.az/userfiles/file/93010037152.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090911263573499.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902225848_cywhmk.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/kujuleropixip.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f33257dc634f8ba8f7414ceced85cdc1/nuraxulogelipezunuzim.pdfIn PDF document text
    • http://underbutter.cz/download/foto/jamurixetipaxunupu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff708af40---10107775089.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/74514138904.pdfIn PDF document text
    • https://mkontroll.hu/File/zuneniwumalefovez.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/58229447444.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/xupulor.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/tajiv.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/wabipofikegexadinemav.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091721351773499.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/bubunujetokir.pdfIn PDF document text
    • https://fivetc.net/uploads/files/sejoxiditixurinusep.pdfIn PDF document text
    • https://businesslife.com/content/files/4905250020.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/fasobofojufikufafuwusa.pdfIn PDF document text
    • http://grossbuch.com/upload/file/pewanudetiraxaniminev.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/26202956934.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b393eb749---jamujuba.pdfIn PDF document text
    • https://proia.bg/userfiles/file/50426942293.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/notavus.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_off0000b60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60F 17792 bytes
SHA-256: e0b378ea189744f1f786fb050accc8b1dd9a9858454536e722d2ada3ac6698d5
font_01_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 11052 bytes
SHA-256: 02fb5bc8ca1080ef4e32dfd8798970e65f5f0e839ef34a6719ff249089f80599
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1