Malicious PDF — malware analysis report

Static analysis result for SHA-256 906d617589c7663a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 22:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec6421f792d1b6d8f9bc3becd2ea3d30 SHA-1: 8c2cb7dab8113d910eef3d97dd2247c1b0d1cd21 SHA-256: 906d617589c7663a66778b0a1518939efad66a2f1dbd2ecea0ab138e607e6e1b
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 sites and disposable domains, indicating a link farm designed to lure users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.gryf-wet.pl/ckfinder/userfiles/files/14735077637.pdf
    • http://pekingtogo.com/uploads/files/19905870137.pdf
    • https://998.geektic.com/geektic/files/90396127887.pdf
    • https://mmeasar.com/mmeasarfiles/file/5721195959.pdf
    • https://decoveinvestment.com/userfiles/file/fimunejisira.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03f9616c---jidopam.pdf
    • http://sabaispa.net/userfiles/file/2067620099.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8d4791f9a---fotonokimigizobukigakepid.pdf
    • http://vitanova-cattery.com/upload/file/14940820493.pdf
    • http://studio70.eu/userfiles/files/43752474883.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6a6e0b40---tipekabakejonowupog.pdf
    • http://etenindex.nl/images/uploads/18051537191.pdf
    • http://chongros.com/userData/board/file/50813795849.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/tofebaxakomalit.pdf
    • http://thuocnam.xyz/images/files/binisunoruwebureso.pdf
    • http://climacom.eu/userfiles/files/21580575822.pdf
    • https://zohopin.com/calisma2/files/uploads/zerekupufovozo.pdf
    • http://p-jtech.com/userData/board/file/muziwowepufexixajogimo.pdf
    • http://gibisch.com/files/files/xerigugusinumepe.pdf
    • https://etadelloro.it/images/file/gobasamegule.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/vuturobigenebagixodujix.pdf
    • http://studiobonvino.com/userfiles/files/luduruviw.pdf
    • http://compsult.net/userfiles/file/31308658580.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161367b3eaa17b---88452188347.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=get+back+deleted+texts+android
    • 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_off0000e55f.bin
f563c12bff360d4f12a1703df01ecda0180fb59fd186a14cf6587e1e525ef120
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 19384 bytes
font_01_sfnt_off00011738.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 16792 bytes
font_02_sfnt_off00012f4f.bin
6cbd17af2c0cfa05e9522a7b40bc283df96824f2cb71463df0dac04d247be1d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 10736 bytes