Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a653edaaaaea1b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 02:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a56f811516f4582db059c229af457080 SHA-1: 5fea1339c7cd29978a696db9fe23126eabe68422 SHA-256: 48a653edaaaaea1b1fdd7035c2890ca57718840d5bdcced1e18b4868750db2d1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://coconut.hu/userfiles/file/88387630799.pdf In PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/darisotoji.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/valirofoxunagovefevefa.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/32348036640.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wogebokuruk.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/53618836395.pdfIn PDF document text
    • http://innotack.com/userfiles/files/xixemojuvetumagit.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/febufulozunibubepo.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/92983495209.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/94114316902.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/simenajopuwesidaguropuxuj.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/xajefijele.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/zazezebujugeka.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nusdvc8hr6t195nep857qepok2/lamugofetipav.pdfIn PDF document text
    • http://ashioke.com/images/library/File/11812033869.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/48602307635.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161392fb2d98bd---27498740874.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/tabilasakon.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/bavake.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339c98a1bc0---32226437465.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/83625120268.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/27725181768.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/44485353327.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a78og3puo2jbalhik7gcpdt4tq/zewuzoxetaxobarib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bgmi+early+access+link+play+storePDF 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 18392 bytes
SHA-256: 812a254c02be8b0fa10ee94663757fb26c1faec530f0ccb0fdf4fecea2da3721
font_01_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 10976 bytes
SHA-256: 792c0a17386113e7727aef978dc6a317424486961d2875d0418cb28dd9ab6c09