Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b623b56623f078…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 02:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1523582331a01250387878d0e41c03fc SHA-1: bf461f687566742fe6d087125e0ceb807e8e24b6 SHA-256: a6b623b56623f0787688d5348a79eac9cb33a114a80a8f3c336a2b04627208f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/olfs1af9imr0vkktfnt2oqfq66/nelijalo.pdf In PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/sulufef.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed59bf2a77---50541998469.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/86009908120.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613095236c1a4---48542251739.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/labakusuzidakakojoxo.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/42320326578.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dojodefonojixelef.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda1eab2767---76126743889.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919fb802883---39808078497.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/nukegogofenijodojomixu.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/26692775251.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/572464a64cf5283c387d88369864107c/gawigakisedisubeziwurogoj.pdfIn PDF document text
    • http://rapet.hu/files/juneribojaminavalejefet.pdfIn PDF document text
    • https://domilot.com/uploader/files/56882945154.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16125ccaf8b2f7---rexabojijixafadal.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/6596765453.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cab07f76e32898b381406e07faab27fc/40631348225.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/powolivezorenaromefu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4798641c20---gezusebemaf.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4rpsmder3hq72637h17s5c3frc/jajorofatakijaxasav.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/xiwokumulezapebulupuwora.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/91a87e4e7a02842e2528f721ee4ee8e4/34763307553.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/23565161690.pdfIn PDF document text
    • https://clinicscrm.com/img/files/fuxudu.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/44931475160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=antonyms+examples+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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 17756 bytes
SHA-256: 4ee2d371e1606e2bd442a535414651d8272df8b647d47777f3b46e38a94b9501
font_02_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 10664 bytes
SHA-256: 491409238efc7b627d9862c8f4ce0fc094b73758ee8ce396c3538652db285789