Malicious PDF — malware analysis report

Static analysis result for SHA-256 94331d31b6f1200b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 23:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78b93b599e336ccb0d4d2ec74b1a3fdf SHA-1: 45a5c6aad3a1a25eb37fe8428001510fa214ab0c SHA-256: 94331d31b6f1200b7058ac42a4714ff3ce8460094339a6aa165a3c7289d0eede
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to download and execute further payloads or redirect users to malicious sites. Several URLs point to compromised WordPress sites and link farms, suggesting an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://propiedades.net/ckfinder/userfiles/files/89091132987.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0473b5b81---8906684623.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/17646079933.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16127b3f2dec6e---59618605957.pdf
    • https://tivicom.vn/upload/files/1285655728.pdf
    • http://ideatity.com/ckfinder/userfiles/files/zukaketixuxakepin.pdf
    • http://splhardware.com/UploadFile/file/2021073118451873499.pdf
    • https://angkortaxiservice.com/userfiles/file/sigerugagugametofifeju.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdf
    • http://scro.ru/pic/file/26849708858.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d1e753f20---nijezepa.pdf
    • http://probeg2000.ru/files/userfiles/files/tosaraborava.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/17376857558.pdf
    • http://inphilong.com/upload/files/60492776456.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/99569711443.pdf
    • https://cissud.com/uploads/ck_editor/files/18594065842.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f65a0a24c6d09d3d4747b5be9981b948/duvopafamabexa.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1610068c46b971---54498855883.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1ce98c6ac22fc97a99934062b2186147/12151680499.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/17q7o5q39oev9h87u677grdfb6/xowigepasoz.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ba8127d1---tawiju.pdf
    • https://themalc.org/files/file/911924135.pdf
    • http://sanzmendia.com/userfiles/files/42512351440.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853b16272---24429785945.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/j7cnk6a3pmijtrqk56llqcdb74/wulikasanexabori.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c9b98e17---zoxerefulewalukepog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=glycolytic+pathway+pdf
    • 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_off0000b685.bin
0a5b35483f4b63a1af877e8295e2ca576b283a3640c6cfe8f03bfaf842bd9be5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB685 16088 bytes
font_01_sfnt_off0000dfd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 16792 bytes
font_02_sfnt_off0000f7eb.bin
4e1c36c6fd9da5f86530e97641dba7d6641cad9c71671df02cdea1f65ea15d46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10452 bytes