Malicious PDF — malware analysis report

Static analysis result for SHA-256 c914c0cb551393be…

MALICIOUS

PDF

80.5 KB Created: 2021-08-02 05:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 038818e3d16f2116653dbe94eb69bf4a SHA-1: c1ebef16ea5cae691f909434d37851d83d20b4f7 SHA-256: c914c0cb551393be0b24ef80e284034256dbffe578e994dd816de656887e0197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm characteristics suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=aula+internacional+1+libro+del+alumno+y+ejercicios+pdf PDF link annotation
    • http://vladjurnalist.ru/archive/file/9518560258.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/muzakowowoxeda.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/74987001189.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076adf86fd1d---kabapet.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c73c70cd---44551849112.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca8338574---sosawakepubogisigalimup.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210801223343_ep8b5z.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/db23d07b361655461fc9aad326244504/lakamasujewifazetepubi.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/72606840463.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4921d67c1---faxisaxoselovozibodivele.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1eb25df22---titap.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5421066aae---51807435438.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c289e133829b9b7c3b1d30a14b3d0934/jidake.pdfIn PDF document text
    • https://agermag.ro/mm/file/60686469299.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160704d6a0acf6---pemonad.pdfIn PDF document text
    • https://estoniapools.com/contents//files/342810622.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/260a4f95b6b9af3fd936c4883fc1e40d/gisuw.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/57314284498.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8633032e---tisux.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4d4a6431781fe87573538ae41bef25fa/34167868509.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/bevasamumotefopuso.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f797c9ec---43346088318.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/godajewanugat.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/newujamexexebafigajirut.pdfIn PDF document text
    • http://edgecs.net/documents/bosunuviv.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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 18468 bytes
SHA-256: 63b5448fd5d8a645e4987831b1edfa744310523d390ba0a8734ae2ebb64f0ecf
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 11300 bytes
SHA-256: cca473a87c59c6a6e0c33437ade3116c01ee6e050943681676a373da60874d51
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1