Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05389efb1d531c9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 12:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17022115b400d6eca8ed61ba44dd5f20 SHA-1: b65f711b2eaca0e337a0023988f48b11700ee756 SHA-256: f05389efb1d531c97e137ac13a03c1a16b88605d1fc9bbab12a7b3a9dc995a0e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://esipro.lu/userfiles/file/sedonekukuga.pdf In PDF document text
    • https://mimpishio2bet.com/contents/files/xopapuvibe.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/jejux.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/wogabimujo.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/95443212721.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/rosekobogitenagewawu.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/3339921225.pdfIn PDF document text
    • http://test-immo.com/file/90276103850.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/25261859399.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a1dd9560596f7aa425320cd8794e08b5/67402245214.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/mefubudogilugezidazu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/908237f65d1007802d623a6127f3136b/bowazi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7e681f487aa29e1b34bffedfc9f26c32/8915618856.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/faroburun.pdfIn PDF document text
    • http://kmsenior.org/file/files/jarogiwekigaze.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/11590753553.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/gipini.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/wibajubafimufa.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/26604009290.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/gavudoku.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/dagixozuguretibuda.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/sijesuletamo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31f6d16c---22811150053.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/vujufuwiso.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905030600.pdfIn PDF document text
    • https://fratellifurloni.it/file/vojivebodaxakodorebos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=training+of+the+dead+bnhaPDF 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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 18680 bytes
SHA-256: df8b756d73b6264f7d9b5f118fc1744da2b793b2ad8b32399dd5a47cc543cb25
font_02_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 10520 bytes
SHA-256: dad9dbe659a3985ee88704361489f869b8d4d8a72ee75205ce9a34fc10a3fde7

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