Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6540aefab383af8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 15:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc0fea1de954ca1047de68d2baa2f715 SHA-1: 7f677fa089ce32ed33b8df8b84523f846195f64f SHA-256: d6540aefab383af81eda6d83befcbfaddd4ba8459ac2226f48c44a6de276ffe1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or visiting phishing sites under the guise of an Android update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=android+setup+app+updates+are+ready+connect+to+wifi+to+continue+connect+to+wifi PDF link annotation
    • https://mediaget.ru/userfiles/files/74286955080.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/64129499284.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/967301642.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090205541520.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2b3a5c4d---91703150130.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/33529005066.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef0f4c0400---kerone.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xuxebugadikajadim.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/pavuneripu.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/36885027946.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7c98d831f---33898127160.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/54890667805.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-16/20210916054433754264.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b21caea342---felal.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/5400400741.pdfIn PDF document text
    • http://berbun.com/user_img/file/tutajatozozisekaru.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e25fb20d07d468ce58070f66ead3b864/77941229957.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gobujejejepepigiru.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902090407.pdfIn PDF document text
    • https://equalland.com/uploads/File/80136941850.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/befunanigejulixebe.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/76377642226.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/xepibasusokogokala.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc7ce60c0---jadadusoxakip.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_off0000b7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 17168 bytes
SHA-256: 3cb685e82462d50f0971de5b5fa44c07d1fd180e98fa70f2bf9454e064f37244
font_01_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10848 bytes
SHA-256: 898fc61897c2a2abc03d04afbfb4382992e8f5ebf93285d7730708a13c3e68b9