Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dc691899f0482f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 22:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c59d9f9bbc3142523970f3c78127b72 SHA-1: 7e3b5247e44e549427e2c4a5b81cc33e94597a23 SHA-256: c7dc691899f0482f12f424a5bfa2cf7c22960ec5c60508b9be1ee77644d7dac1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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 https://oniceh.ru/uplcv?utm_term=low+end+pc+emulator PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbeed8f22---vagojiwomawugaxu.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/25429651181.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/79298480067.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/kuzoxitivusutugaw.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/26166993806.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/mekowufituz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135866cadcb6---wumijikipazeranilav.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/guxumoxefupajixijapidejan.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/1562490855.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/dapurod.pdfIn PDF document text
    • https://auto826.com/uploads/files/vokukedawoz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/73u2nr31nulub7cllem5jo20tm/sekulowazetis.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415e695c145---33498298273.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/winuraweguverogikogerozoz.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16142c86f8f240---38130715435.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/folopenonosepuvutafoga.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133426c45291---63951774816.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/kemofuje.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/gakerazanokitanege.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/94878726398.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/70601677975.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/pebolamajiwosirera.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/nazarimulewapukutigeven.pdfIn PDF document text
    • http://nktrading.qa/file/files/jodiguti.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a3517875---vikumexofezemere.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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 17240 bytes
SHA-256: 5bfbf5b888dff3e27d4fa3540fd793ea8b546117f8a1d0ec8018e2bcb21517b9
font_02_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 10560 bytes
SHA-256: d91c4d35e28ca026a7fcadf7e9d34d546001639fcb54adcca4dd0eee56a4e66f

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