Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a018a617d92625b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 17:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70e6d809ae0ed2648844709cbc7900d3 SHA-1: 4ca44a417947a6061cb3b97e6d0f348bfa6d6f65 SHA-256: 6a018a617d92625b4a3ab37b72e87ded3243743d8c208ac396632600da9e5b49
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL suggests an attempt at SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=android+emulator+mac+google+play PDF link annotation
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jififidanijalefiveso.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c102ccf30858fb10b1dacd9a39d4b94/lilijuvovafesifigutolago.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/ruvunogojefesavaf.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/45520127871.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/romuwi.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/dogovutabi.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/vesirumufepuvifasafidik.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/45784099396.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/26877525396.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109080753245658.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/65874706971.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/11026483584.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/ripovimo.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/bamel.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/lumajegotafevatubirixe.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/lasinesaxegivobab.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/32999180432.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/boremu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0d26ee7---sikuboluropa.pdfIn PDF document text
    • http://cke.hk/userfiles/turubigutasuruna.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_5D0BCDD432E35DC9.pdfIn PDF document text
    • http://stonebreaker.at/10166495630.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/22058187091.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/gilawoduxuwumofetam.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/savabodozovametinijun.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161364c02b3473---pemara.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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 10884 bytes
SHA-256: 94e0a2d4900cb0c613df594de6dc17a19da3374ffd70e2529046ba253b9086fc
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 17180 bytes
SHA-256: 351422a832ae09aa1623586606ebb46af2f3c37ef10d41f6a443119a1884b7ca