Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c271d34035fae2d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 13:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa3d280fe29f924067cc9cdc9c8ff928 SHA-1: be4c494ff804e2c0e3efcd63f2c0004672b45156 SHA-256: 7c271d34035fae2d9ff0a5310148e703dfdb0b38b0dc44a3f8c1381bb39e64a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous external URLs were extracted, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=cps+texture+pack+1.8 PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cada3f77d57---vosusomibevirasugiroturek.pdfIn PDF document text
    • https://hoavily.com/uploads/files/vinojagono.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wopixabuvuwugagudebir.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/zasivemod.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vofuvotu.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/38046875880.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622171178.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/bamamiso.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fc5014157---bajumadapu.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/1230444461.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/86591538113.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/n85o4q6npeb0ds74vj68o7rib1/79997183274.pdfIn PDF document text
    • http://keitbg.com/images/files/suxefezobozube.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/39009652349.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e3a770cf---89801861640.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56386c93d7---jefas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ceffce082---42641399281.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/67738270872.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/39e7b8413f13ac60a0b1cff1a39abd71/mojeno.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16126f2133cd79---1791802070.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe4a55c40---54056780538.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606d313e3e48b---nomelus.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/towixudapivamotu.pdfIn PDF document text
    • https://sanidom.pl/img/file/kevomo.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/2188700967.pdfIn PDF document text
    • http://envigest.cz/upload/file/77447958868.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_off0000bef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF5 16288 bytes
SHA-256: 820dd4bf17841931ab33c117c1d5b0acf067fff80df7675c247137c8d60b7a61
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 10656 bytes
SHA-256: 95702f593ace3593248847d7ee3949cc6c568062ae2c7ad34746325781605617