Malicious PDF — malware analysis report

Static analysis result for SHA-256 90afe34297d52e7e…

MALICIOUS

PDF

87.2 KB Created: 2021-08-02 14:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 602a9e8caece45a8489b3b8d0930e794 SHA-1: 4ef61199990b0851e44589884806a7de7b3ae876 SHA-256: 90afe34297d52e7e5d0baf1832fb7a9fd0bc9c019e2183c93e3187cc6c83bf3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=youtube+how+to+make+easy+balloon+animals PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4b7f36f222aadaad3618895a5ae4558f/tinebevogo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/72229199025.pdfIn PDF document text
    • https://renault-service.com/userfiles/kapubum.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/jefejujosixujoxig.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/9895343260.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb093d823b---10698673098.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2679620e3030869572b09ea4f368b614/88625492246.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/58310f9eb43249decd388fad68bab5a8/40056780722.pdfIn PDF document text
    • http://goref.ru/files/file/tabirituduteganudibud.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/176243b713fc063bd1361a0b292ec30f/wifalokigexizomuvab.pdfIn PDF document text
    • https://jurad.eu/files/file/warezeloguwewetogodoxezit.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/43845615969.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/duduzamezukowosopilabo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gf5jbu7au866e8v8e0ud004a7/joguditebufoxi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c35c7fcd0---75455603998.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c0debc5a---febakokixalowoponab.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c516272af7cfb7a86ea5bfe89d0e0387/rijexekitorugilekej.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8528f2456---31549997733.pdfIn PDF document text
    • http://wsm.hk/images/files/sekenadowulolibav.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b75608c2465---belikuwe.pdfIn PDF document text
    • https://elemonbg.com/Files/File/jexifapuxixisa.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/35845429051.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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16852 bytes
SHA-256: 487674b007fbca54d3029bb9e6a52b70a25f3ad383254a72c1f6315395db6f21
font_01_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 10788 bytes
SHA-256: fb3c2ea1d13468bef9b0b44028b1163817c5e2a5b6da6fc835b4cf31f1557f10
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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