Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab5100862deddfc…

MALICIOUS

PDF

88.1 KB Created: 2021-07-17 02:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ef95495caf689eb7bdd4a0417a45a67 SHA-1: 4ed81ba18332f6e30f45bddcd2a1821132e95f81 SHA-256: fab5100862deddfccf6fd44508bcff6f9d6973eccb5835cd35a39e67e42d4fa0
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, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to websites hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of numerous links on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87f04f93b5d4ac6b1b50ec35712976a3/nelul.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/ce97e7ca84d5a6edd78ec03e801126f4/86836405604.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608413e8a0c6c---82517368881.pdf
    • http://afghansolar.com/userfiles/file/tajukedezugaligizupofesi.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ba64d1f7---jeretorutesetuzo.pdf
    • http://vititanon.com/user_img/files/riloxuv.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/13079999278.pdf
    • https://go2germany.ru/files/file/47997214750.pdf
    • http://asckhn.com/acskhn/userfiles/file/72112036853.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087460f1e3fb---gepimunafujexikuri.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d967a52d---podizopekasixotonudevoj.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c6c7155d15150ffc4e4a80af2f3d8160/90740833334.pdf
    • http://humanitool.ru/userfiles/file/35252335574.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/99d2527bf6c266249d7cac217cd31b5a/2431887268.pdf
    • http://muszempilla.com/files/file/20408803115.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/brmeet832ukci8kbf6jqfnn15m/73491141573.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/40891e57ca03b94003bbcedb80afc160/vigezemi.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e55a55fe3---lukavunekedanoga.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e725d158---28425895464.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/jutebovanudusipu.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d8c6f79b---15487936759.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bece73d1ab---8499771108.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bible+verse+about+the+devil+being+a+roaring+lion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63b.bin
5d161d54cfd0dfef153d7cfab0c41573abfc2f84fe55101a00b7dc2907c73ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 16876 bytes
font_01_sfnt_off000121fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16792 bytes
font_02_sfnt_off00013a12.bin
58f5695659b96e822bd58a64d6f83a9a95df504a160a6fd4154ec268df75cfdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A12 10888 bytes