Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0564328753303d7…

MALICIOUS

PDF

73.5 KB Created: 2021-09-25 07:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9521005a9249d43641fae4f0a179fde9 SHA-1: 51284635cf21d8df60960675d753feab992e02a9 SHA-256: c0564328753303d79527259c1a69af5d794f129ae0d0a01feea81bc72b5bcf9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristic firings indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, suggesting an attempt to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vector-mebel.ru/uploads/files/42978928620.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c2c0d18a9---komemimobepevivaligogu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/situmiv.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/garikimekudizapexoli.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/gunatotogurikevanevutepo.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/sifaz.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013b14f887---12055783674.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef4464f64---rababeri.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce2061e63b---61784939435.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/18229977845.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/xizaziwetikurufibubapo.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/76113323579.pdfIn PDF document text
    • http://dalaichau.com/files/limilokemabegogev.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210921061502.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xuwukezaximalaxanut.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/saruderu.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/zasuzutadizujodelivini.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/puvedipulekiwulevinisuv.pdfIn PDF document text
    • http://texmet.pl/userimages/file/45549583240.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/09aa7295641750631fbab4070298c1a3/lujokoxi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161423b1283de4---ridodavor.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/fotaluro.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/nolesezidosodix.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/nirewawefotidonomu.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/pomijinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+hustle+streaming+vfPDF 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_off0000b6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 18236 bytes
SHA-256: cd2be5d3fd435061dd20b32dd44d1456431df610509fb6d1a6ae2996aaefcb8c
font_02_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 10668 bytes
SHA-256: 9ef00071876e3a2a8558abca12bb9846df03c9cf2b4339c826a13c1d1e50a3a2

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