Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ec94d19b9910fa…

MALICIOUS

PDF

93.8 KB Created: 2021-09-05 18:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e82160d1818c8e3dfe49affa4c000d9c SHA-1: e9ec3b73c44a9098bc36011ee3179ad037545ed9 SHA-256: 43ec94d19b9910fa95d722767878718562e549db8dbbdf8e9754755e0587571d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate the PDF links to multiple compromised or disposable hosting sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of a PDF reader vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://auroraenergyproject.it/userfiles/files/wesurokiritagixumam.pdf In PDF document text
    • http://ndt-ultratech.com/files/nenurow.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1315e992cb168cd36edb2faded866dc5/fosogi.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/54420528353.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3ed0838f386b8eb42192f817319f6a81/56908251364.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f57f7c093---kapelig.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/81134639909.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/knvg0j27bm33rj4clb989j7at9/56179191139.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/57320619390.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/vizemajetagus.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/80713432671.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/42656897679.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/15116336852.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/xetox.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/31076142245.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f771b1399---toderap.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f6d57d64---fuzopubevorewixuweji.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/zuvugetaxa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ssorhf5l27pdbhvmguq0pa50jd/45111979453.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/67325600469.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/93769ad750febf2fa21b1b8452640ab8/65875924503.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/48843469985.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/85395849727.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/xetasuravokixob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+evolution+of+personality+and+individual+differences+pdfPDF 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_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 10960 bytes
SHA-256: 74c200dd47c15151bbdff292affdb1e15fba9b6b254d3ca9edc290924952d221
font_02_sfnt_off0001390d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390D 18360 bytes
SHA-256: 9b2063371e5e5c2dc131c7d87ba7c197d5041ff99c1879039e9e98ed5c6c86d1