Malicious PDF — malware analysis report

Static analysis result for SHA-256 4946ce79efb642b3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 13:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f29a6734d04b6ec076a2e331d15f10c0 SHA-1: 7a6e4e730f1f93aa898534184d6a60fc33d51e16 SHA-256: 4946ce79efb642b3c3fc617e79333ceb7c4f6df7952b4ed0b9f588507754c791
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download' lure further supports this, indicating the PDF's purpose is to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b59ff37c7986c741e6b2c20ddf90c428/xevibujaluboz.pdf In PDF document text
    • https://j26clean.com/upload/files/95040599817.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/dodoxajif.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///vujal.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110f7a054d---51351535538.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/poxexawubiwewidubaj.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/guneberabolopifasad.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/fokitanoposivataradukak.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/sibajasowadefenabulexi.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/78585272848.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/20598547806.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/75923994165.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/31959372933.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/jenanupogavukigekobofodox.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210914055640042.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/30194596459.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/matakonotin.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/baguwuluz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614285f398215---zizafugo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7c6ea236c869bbf294539e270999cde8/lajajekolenawezufubakil.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/zubajexuradobila.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131059c2b4d8---53002399856.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/71132612326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=install+mobdro+firestickPDF 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_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 17184 bytes
SHA-256: 6dcc398fcb6aaf932d39a74109e9c6dcf84cb73360ab434611497b35adc5c01e
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 10820 bytes
SHA-256: 39fd7fabc36eee955d5851506dd01ec883859eb87bd5c8c101a8657879f1a465
font_02_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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