Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5f7d9073683a64…

MALICIOUS

PDF

88.8 KB Created: 2021-08-03 06:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddfe81e51278dad64366895a97c3661e SHA-1: 3670ff462dbd1eb6fc0520fc6b5b6baac963c5ca SHA-256: cd5f7d9073683a640a556d754cd9f4484842da169e270c5982264e308623430d
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://rajatotogroup4.com/contents//files/nogurevefigodone.pdf In PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/30a88d7b7eb08b68a3f8e2efa6b072a7/88442821954.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092167b6e12c---durewedi.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/45318536635.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a83af96fa2c---75576932262.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/aa5a2a6fded86875cadd22fbe82501df/29840512661.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/gulusuvuvilafabapupezol.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/nisutobuwapunavunew.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/7506655190.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fee26663---zigukiwopu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1e5167e1---31508864366.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4554a704553896855e3cbdaaf4037f71/12027165204.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/98647049277.pdfIn PDF document text
    • http://lucann.com/Upload/file/gexelodilimenemeseru.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/mulokavezul.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/sekowudidirefapemozumer.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160818687dc8d5---20068617345.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0564199e93---43433605875.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb5e34a7e5edef6dbf61dac94d71d0fd/72390271892.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/16215786127.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/60c8f45cc2c9c6ea29bcb30a1a61a017/nozilixivixarajimijiram.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/06143d76a2317862485f75e304aa53d1/44949599502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clash+of+clans+ios+mod+menuPDF 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_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10676 bytes
SHA-256: d84135b65e0da821288f28f53502d8eb5543550eea7476e57b2385ea601a952b
font_01_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 17108 bytes
SHA-256: 2a582299099d7b315b566d61a8576c3c0bef69e22686700d94b6ec341cdbb075
font_02_sfnt_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1