Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b12addaa46fecc2…

MALICIOUS

PDF

93.2 KB Created: 2021-09-03 13:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5205e0e0f4cd1e02eda4a8091831f16c SHA-1: 2bde9bf79395a535777d46bb317554283ef5a82f SHA-256: 5b12addaa46fecc23eb517b3ee431b0281c86a4dfec3d51ddfcb13224174bdae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains a large number of links, many of which point to compromised WordPress sites or disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates that the document likely attempts to trick users into changing payment details or accessing fraudulent bank instructions. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://luatsubienhoa.com/upload/ck/files/42006725634.pdf In PDF document text
    • https://matteagianotti.ch/userfiles/files/36162264593.pdfIn PDF document text
    • http://aps-mes.com/files/file/nogojovakos.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0bd92fe207be1313dbd335dd7bae6755/lofewarajurisazax.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/92136628205.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c71d84ac27d09c3558b60ec6d2721a7d/pokefogo.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/suber.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6b80f5dc97b209957301f9a9ae456519/pamabigigiboduwakus.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/85595641047.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/74099479919.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f13a0b6d3---sejafadazigu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc5c20ff7c---42906976231.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/62294276176.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/908c7f55fca001958e607deb8126af8f/xowesobi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/94820214438f0c8af5f6a6d3ee3441dd/87952038385.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dee48b94---50839501204.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/21388431179.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/79d22238c8ea1e6eb12f10015e95164d/piletumugotowivobafebo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a602f0f25fd---ritazozupobobo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/df18c6fd5710a457e09c3c5c81d66163/giwubuzoxurinovetazezi.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/33455614706.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e10963d364475c3ef821704e7f80b90a/72816565909.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/31008141205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=west+bengal+ration+card+application+form+4+in+bengali+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_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 11176 bytes
SHA-256: 03350ba34b36c552fcfda54cc876d9f9733036e1c6e348d10f198b912cda7d15
font_01_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 18324 bytes
SHA-256: d9e0a4ba38cd6a51b72a18d9468792d3ec5499ed0744ed2e9a74147249421c5a

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