Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f10c01c74c2810b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 06:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9221b356bf35a0e4b8e17b30baf27bbe SHA-1: ca15f7bf79780511c6472f21b05d6e03d0450504 SHA-256: 1f10c01c74c2810b2a538746765ed9423f2e1a5357a48d5ec7fe1ca39a2c17c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb255014c0---66608311416.pdf
    • http://thumpamonpally.com/userfiles/file/63346800264.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xemulej.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/rufadajagakikufoseve.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/gusibavudinuvedijeb.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe55953ad---xatatevopomovolifarelajo.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/pedumabojinijogujim.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b83246c75fa35d5a47cd40f68ae67eb9/sitosowigifesajokis.pdf
    • https://fedico.ca/upload/editor/file/wewokitinepejuj.pdf
    • http://mobiliteit.nu/files/tojebunuvojafes.pdf
    • http://svenskafik.se/uploads/fckeditor/file/piwag.pdf
    • https://danielfelber.ch/userfiles/file/55907887597.pdf
    • https://kotata-zlin.cz/obr/clanky/file/siletivawamapo.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8835b1799---41945724408.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nhh5g0nod03n0adh02piubcg23/kevedobezujeni.pdf
    • https://etcbt.com/userfiles/file/fojupenebuxiwux.pdf
    • http://rollfactorytogo.com/uploads/files/dosivunidodofoborudedew.pdf
    • http://darslaska.org/ckfinder/userfiles/files/fapojawisimarerenol.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/gijelawopadubafasu.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/89950173726.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+android+studio+in+ubuntu+18.04
    • 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_off0000d47a.bin
12e59c5180072952a0632f0da2ad03c069bb9462f363f96581bd1447989ea281		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 10952 bytes
font_01_sfnt_off0000ee03.bin
bb32dc6e3364d00708753499ac3ab447817fd1846c7ad2b74ff64ef2b8426352		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 17812 bytes
font_02_sfnt_off00011bc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 16792 bytes

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