Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae5e4f51c17b5af…

MALICIOUS

PDF

83.5 KB Created: 2021-06-28 20:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3a69b2d530724a81c77b3247a1a215a SHA-1: e5964e98bea7e739bdb4ec2f8846c463169cb187 SHA-256: 5ae5e4f51c17b5af09d42192ce2cee6cfcad71f8934c7fc9821a1dcfe45bd0a0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggest it is designed to download and execute a second-stage payload or redirect users to a phishing site. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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 https://wodepcb.cn/uploadfiles/files/lepujanamat.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3503714d5c3f444d1852835928261801/tonenupof.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a317c507ece---10800856986.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d54fb95b3cc6853b7516c0943ce8d41a/mifib.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/ralumufiragixowogi.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089019cbcd52---72507328211.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/649a14b074f56d7ab556b5d2edfb051b/33955161883.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770046656cc---46878958932.pdf
    • http://limoride.net/gallery/file/35179963001.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e2a5feca9e1dda246fb012c2b1403ae9/vikilo.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160964c6287d31---xukadelawufuguse.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/32158211186.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff87fba663---nefukif.pdf
    • https://acronimocostanzo.com/userfiles/file/45269958935.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c74b77ae42d---vuliwevivefujebizisamex.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/56b2100061ee36eeccc769aeb39f2db8/kewudub.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/mofatirap.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b400721a289---75476104090.pdf
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/99724466065.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/luh0r3j0cid0cb8b1s6kveg2m5/xaribezuvesidudupizalopi.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074348e5d315---93144493897.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160898ae6e6217---fukasijidur.pdf
    • https://jotekonybakterium.hu/userfiles/files/lunukiwuzapevexojajidexa.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075be2f89e48---jikelibug.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uvml5jro2g8vg8rr68lnbfbess/85426371482.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=oh+how+he+loves+you+and+me+hymn
    • 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_off0000e278.bin
4cb27229c7caeb6b77a00834f0505222fc739c7d0e2af151b58773ed2ddf78f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 10616 bytes
font_01_sfnt_off0000faa0.bin
89742972f2b85a437afc6f108082d045262132217d89c8665d1ca62cd62aa915
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 17508 bytes
font_02_sfnt_off0001288e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 16792 bytes