Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b377051f67322dc…

MALICIOUS

PDF

107.1 KB Created: 2021-06-28 00:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 962d110ef9bdd4c64550a8ec7b4ee76a SHA-1: 3453fa7b69c0ab1e214384ea6a21577d5c864b7a SHA-256: 5b377051f67322dcc9103b7848bd5af2bf017e96ab38ff0ae335906e5174487b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and compromised upload links strongly suggests this document is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=do+sand+bees+sting PDF link annotation
    • http://sklepjola.pl/userfiles/file/5861159524.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7ee04410---95178571617.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/ropokefafujid.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/79640408879.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2afc544d83e94fc954874bd6423f07f5/mutesevorinakafewo.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/10182758932.pdfIn PDF document text
    • http://rsst77.ru/upload/files/lipejewol.pdfIn PDF document text
    • http://ridendo.cz/files/file/meximewetapeto.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ce81cb3f43c---dedexubonodito.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3f2faa672de4e5b5497679666ce16fc2/89135695460.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c9235e33---27831730469.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/67ae55a144aa1843a28088b02d2bfd98/pakekimezad.pdfIn PDF document text
    • http://zuche0551.com/upload/file/73823502326.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b995665c---zeruvozanukonipimino.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d29efc901d057dd3a361af587568a7c6/15820471342.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/fm0hededev3r3ce5orr6kgrua0/84292564832.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jolofetutavo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1403fc8961e0bec5ef550e1d2b39b534/30609354719.pdfIn PDF document text
    • https://mfdesign.hu/files/file/79647755027.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/gikoruzesakikufikudi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5527e8ef---29553929420.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160821084ccc5c---9675514942.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2407435cee---57398485107.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a737e15a7f---laxarudizofivopipexateja.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1d2d7959fee1b47f57acebc6ab31c372/siduvilakomadet.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6452a17265---tozilefu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1a8682ed849df615153b47b24704e21b/foxefesunuxikupixu.pdfIn PDF document text
    • 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_off00014279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14279 10416 bytes
SHA-256: b923a9a84e9acf19693a141d40505e637737eff1ac6cee2d3a91a64c4bcbb986
font_01_sfnt_off000159ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17211 17328 bytes
SHA-256: 77dabdbcb4fd9ee7b78134fe23b1ee63415ec253c5b2a50f333a300ffac83bae