Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ac42748991cefc…

MALICIOUS

PDF

77.4 KB Created: 2021-07-30 13:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47c767d08fd7abd1372e4abea54e937d SHA-1: 814b9700f534d3b4595a663cbb6066dec7f6ff8e SHA-256: 15ac42748991cefc7a797492252c82458ff4f30302e517ebdecf42680a3920da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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=bossy+verbs+activity+year+1 PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d768bfe54fb---monavetubupotilavosir.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/m1s6nj3gjjfvgrni5acl5kbmjk/7217119242.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aea01b607---pewubilegozefogeno.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/66078550535.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/580a6656d3abb284fbd61830ed65c151/19964263023.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/3316381927.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/goforiwarijuf.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/e159a12d5c56aa0d4a5f1224445012db/mujalobirepopiga.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/84878332886.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/14600334310.pdfIn PDF document text
    • http://parfumkin.ru/files/files/gabuvijaf.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/971822542df7415d4d7a8f339f656ae2/ranuxivirobuzupikuvup.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/54688649104.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3930bb18---85077117022.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/36407172484.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/s4fqgs1p7dmqibj7fmlv6s8us0/rixevewepem.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/kosagojiwedafijigusedelu.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/pisuwekoxe.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/xupozulabajoraxawireme.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/65a3bf08a3917f02805603bf2750050c/22298975309.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/80078036424.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/fs9h03olfj17qrs1lc9kddca6a/40372311226.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/71139498604.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ce30174ed---70082642009.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/38177852341.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e6da70ebf7d46490f073b6eb7dea4fc1/91455820797.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/33766910287.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_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 16596 bytes
SHA-256: 69c4bda73bccf20fa72fde80caef3e761b52d363193776ddc78b5b584fb8bc55
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 10496 bytes
SHA-256: c94ed68929f8b90cd1a8ec3d15cc35f8cdd18c75cf671b6d350de4afea34625e
font_02_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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