Malicious PDF — malware analysis report

Static analysis result for SHA-256 127dea9b9f2d6d3e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 23:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0653ff8d952e20d5f33cf3a2778c1eda SHA-1: a85e0ee0b5831b299f12bad68e01f43315630a08 SHA-256: 127dea9b9f2d6d3efaa48982e6b3d9683be9099d81a6728d2442e34eb01e06aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many of which point to compromised websites and potentially malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sushinamu.com/uploads/files/90660058386.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527845646e---fiwinerurike.pdf
    • https://filetorme.com/upload/files/wamowuleforonalorasejur.pdf
    • http://phanvienphianam.com/uploads/userfiles/file/57938100358.pdf
    • http://titusauto.hu/kepek/file/bolevili.pdf
    • http://copy2d.com/ftp/image/file/bajiduxolapigas.pdf
    • http://www.parinet.fi/tiedostot/files/76871500082.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c79e177fe3d2f06b3597289ec9d9ef11/57387705992.pdf
    • https://123natura.com/stockages/files/dotaf.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161467d98dbeff---lepugodevusu.pdf
    • http://sportsgarten.com/editorData/file/kexolibogixo.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/62277888950.pdf
    • http://studiosantomauro.it/userfiles/files/5004735346.pdf
    • http://nuitsdartistes.eu/images/file/bigolamexoxekojog.pdf
    • https://zlato-eu.cz/upload/files/juzapipuzivakukafikob.pdf
    • http://multi-accueil.fr/ressource/site-image/files/tulipijerozulet.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161401037de8bd---41286888709.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supebanaguv.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eace0eebeb---wubezuzeduzotumalaxogij.pdf
    • http://teenmag.cz/userfiles/file/vovunapemibegeriladivib.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/caf6d563f205163715b107917d1b31cf/72120214495.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/todak.pdf
    • http://paulgraphics.paulsfashion.in/files/gijabuzigexalifuwesutazos.pdf
    • https://wineart.online/userfiles/file/57583891993.pdf
    • http://creptiles.dk/userfiles/file/xutarovol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=plastic+lumber+advantages+and+disadvantages
    • 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_off0000eb17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 16792 bytes
font_01_sfnt_off0001032e.bin
98e6b5f9b2dfc76aa056b382f65b4412335af0556afc85eabcc0850966cd1c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10900 bytes
font_02_sfnt_off00011c37.bin
b7ccf323a96479d663b99b58f7d8f044b2924ce0e18c9aa4fad1963332536a24
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 17600 bytes