Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2def34dda60082…

MALICIOUS

PDF

83.6 KB Created: 2021-07-26 05:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 467fa7013073ba6e64a618b474555f7e SHA-1: b5c5c36d123fe42f743843fca669b834deed6636 SHA-256: 4a2def34dda60082691048248b6749de5687253d2db0c846693067746906acbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8813bd3bca---pepirupopava.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7b765c1659f51ee7af0b557903833c8f/terutazoxabebanatadisogax.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/92217179899.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d50a79d85d---60760576726.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sasududaxasafam.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/muwerizewasuzokemadab.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/dc9tnpf0veuu5k5r8bt9n5682o/wupibiweberebifapirewupum.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/227a945eeeac001c25836a3d2f44a861/zovik.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/41582789945.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c53c97c2d---46299508585.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/49473722456.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xafofamexolofizalozezuf.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/nuzesisen.pdfIn PDF document text
    • http://islandpointfl.com/userimages/36758263980.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20efa44522---jeromatevuwolo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/abcf207a7805ec477b893741e4716627/tuxevapozeguvexowawunabud.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nisox.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf5e3b8f3---63600918692.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826439b1846---kesukarozebami.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/36199208232.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/78584018190.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cc0c95450afee330d89eb0decd4078b1/93851264841.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/30367417641.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/93295711285.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ca36248a35b7cbf7f6635bec18315052/75452625129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=words+that+start+with+enerPDF 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10380 bytes
SHA-256: 4ef544134ee343130c2e4f3afe58b4eef4fb0715b4d9cb961b172d1d7ce06d4a
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 16416 bytes
SHA-256: 3079ce1ed04cf1c8893d9f88403ab161103c6bcf7d27aeb79d58f19683b766f1
font_02_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1