Malicious PDF — malware analysis report

Static analysis result for SHA-256 449bbdbd9d97d270…

MALICIOUS

PDF

107.0 KB Created: 2021-07-31 05:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8599b8a239e28052a027dfc1f4d32ebd SHA-1: 8a33731b70fe33cd4547ede583d0e1e9866ac4ee SHA-256: 449bbdbd9d97d270a142385242e75c9245621962c84837b40ce4c4c322e78da7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into clicking malicious links. The PDF structure and the presence of multiple external URIs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52652b5a---bobisudolutape.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073dd3ca6.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/78855715193.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/49307844669.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0449abd50---nevuvizaguvovilulimararov.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h0hpmuogj6be3792d6t78f2ia2/34302525034.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/66624016c2b840770a780e3bd6feec73/68233457191.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9cb747e1319a61a147ba4b97ca7d7323/pegawebilajov.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/24953fe7acedde4fd8c70744211c0353/60532721578.pdfIn PDF document text
    • https://curvy.tw/upload/files/52299989977.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f8a1426d9---nadalitakulamijufune.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f4b2f5bc---79887667881.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b4d8ab1d14f1cd0c2c12c62ccd2dd951/74096436858.pdfIn PDF document text
    • https://carlojans.com/cms/file/15007889036.pdfIn PDF document text
    • https://afayl.com/userfiles/file/11663383329.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/17606719844.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bovogoso.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/stqrv0l328tave0vbubcro96df/7829713793.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc8c85a6c---nudavubunile.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/30093905023.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fd5e4e09---48070654811.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/18708528406.pdfIn PDF document text
    • http://farashimirooz.com/files/30925454901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=telecentre+entrepreneur+course+final+exam+questions+and+answers+pdfPDF 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_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 17496 bytes
SHA-256: 97ecee01ed573549809f0b3cc379059c8c0398fefbb2313cd49214da913d6540
font_01_sfnt_off000168e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000180fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180FA 11176 bytes
SHA-256: bdae7aac42b00b7c3e98a627ff1d6893b4401d221533663ca4359c4fbede051b

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