Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12950f2d0167784…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 08:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b22dd79ec67c18f2f1676560a7b2a6da SHA-1: e32e4fecdd1f7b3f26ed6e19c494a874a474810b SHA-256: b12950f2d0167784fd48678b4b606108bee123e1d8ae55550fa7697e13aeb1bb
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 WordPress upload directories, indicating a link farm designed to lure users to malicious or phishing sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e50a73097d2---pixanejube.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/80c7ccd79c21120ae8c13915444cd532/vawinivuninejezexopil.pdf
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/79882213566.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d24bd8aff---kavulodowadix.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/91515625124.pdf
    • https://zahidnawaz.com/UploadedImages/image/fogukifasilopunejurufafo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6dqta07n457npj89vr6p9u3nt2/lopexibapamosenolebofas.pdf
    • https://manhremhoangvan.com/wp-content/uploads/files/silalexodev.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddeeddf1a0---nugivomijakifipejudugezij.pdf
    • http://blackivy.pl/userfiles/file/pemobubugisixuruga.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b9783cbf82f6bea49cd78d8895b1db0e/womigamorudufubanoraji.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e878b2add200fbfa5ec8978a4720dcf8/gexopobowupax.pdf
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/rapuvozepodu.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g1jtmodg73br9ricsa0rm6u39f/56273578396.pdf
    • http://palyavalaszto.hu/teszt/upload/file/rozaxipuvukijijefig.pdf
    • http://www.tobywells.org/media/fckdir/file/45748568216.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/6856154929.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be167004910---mukake.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/besasitumef.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/84837828689.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ed90c3159---95957302973.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=asphalt+plant+manual+pdf
    • 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_off0000e572.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 16792 bytes
font_01_sfnt_off0000fd84.bin
843c9f73ab268b2c923c69957ea49af062c509d226af300e31c9e0c60cc93bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 17928 bytes
font_02_sfnt_off00012c34.bin
6f897e6fed19b8eb21c93ed4f24f9a8e7600f611820b554dd0a240bebe022a14
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 10400 bytes