Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9c8a6bde2e1156…

MALICIOUS

PDF

74.4 KB Created: 2021-07-15 14:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66aa4abe51801d44cc573b9802e7d8ca SHA-1: 1ef61502f19a7491b9f958c21de6b0b23f122ba8 SHA-256: df9c8a6bde2e1156013e0880616d5cab09bf20e805039589ae8dbd28639bb1db
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download' button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=let%27s+just+praise+the+lord+hymn PDF link annotation
    • http://gat-asset.com/CKEdit/upload/files/jugolagijimutipi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64625c0d5d---begipajowusimaxipak.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/dc87e03966ac65815a7fe23dd10d0a0f/69118611430.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fuvojapukokapozoxumuga.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1a82618b5a588c49c3ce4aa9d0ddaefe/lonawomozevorakagezagobuz.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fbc1598fea9aaf310ee362ba1e0115ee/wisavusojuxopikeda.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/kibazerunagipajekerixagav.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e6fed26bfacc018bd1e709a77aff0cc7/78396139453.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/5604045909.pdfIn PDF document text
    • http://jaatkinson.com/userimages/luzegap.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/96256848723.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607149578b9b3---74756019838.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/71874515648.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9789718e4---wojawipira.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/2512667136.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/10339027969.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/masisimu.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/baligamibimimoni.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jvd87nt5ral76u438lg1aqiha1/ragedakamowowizilid.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/961143063.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/98e871e04788d547b1ddcdf5ae0fb8dc/zafepakexifik.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/24c1cf7608c26292ee55e411646a8b91/diketasug.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_off0000bff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 16592 bytes
SHA-256: 5c7adc5b6845509f4f2e3f41d5f0614117309e35be4c62490f9b14be8ce3b9cb
font_01_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10992 bytes
SHA-256: 76b2d9fe96f2d0b98a91dbe47aafa86ec74e46ce5a0a74df2d6779b19f014fe8