Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1e06666a0fd970…

MALICIOUS

PDF

87.1 KB Created: 2021-07-15 12:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d649b983d58e90b139391bd7b2eec46 SHA-1: 0205e136a28420851f0f2e5184fc93e0d760d1be SHA-256: 7a1e06666a0fd9709edf737be88b66017dd3dad416d876220da08f6ecf0db5d9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://sushistoryus.com/uploads/files/jajupisufo.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa6ea092d---42479381666.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/86120293634.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/78911249467.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f8d942bc---kuwanen.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079c168a04e9---gudoguzasarepefetu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/wexubirusijivupen1622282170.pdfIn PDF document text
    • https://qnzar.com/files/68565457911.pdfIn PDF document text
    • http://placc.info/up_image/63525959381.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83be89d35c---jeromivigorunegivilenu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effd199289b---2124171976.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/628556535.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e23cf48b21a---69192695271.pdfIn PDF document text
    • http://www.centralperdana.com/file/mibuvoburavoxinumudogefus.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b7e5aa31acd9baa6d9efe5370f7b8da/87119981671.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/sokitunejisaleb.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7hg25ll829clqk22fk790rmkk7/83326394477.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58653222251.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bfcafb6f---539584920.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/780b4336dc6c2bb64680ba93db71cc31/siduze.pdfIn PDF document text
    • https://unosms.us/userfiles/file/54809158524.pdfIn PDF document text
    • https://birotex.rs/images/files/26106336369.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/zinaluzolupakaj.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607199a4ce2b9---57276177258.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/sagarudiwekawor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=difference+between+noun+clause+and+adverb+clausePDF 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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 10860 bytes
SHA-256: 18c9d996ef456b3a7412808583e28893284809c89d94cdfd1c0f0810da3a9dc8
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 17004 bytes
SHA-256: 49fc7a4323a672f11150c1fcbb42a53680ac45783225117330f52ef0676500ae
font_02_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1