Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce57af44b474bea4…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 14:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02e6135565c4d24c7365b8df79dc50e5 SHA-1: ccbafec2e96daeed146fb8f656abb451527651d4 SHA-256: ce57af44b474bea48b3035f9d64c3db514f6c2bc5d3579c8faf42b53534ce348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, aligning with T1566.001 (Spearphishing Attachment) as a potential initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/265d50d6b17858d846021afccccd3914/89116615369.pdf In PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/11126974821.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/fataz.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/33558061047.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/afdf1e803499e0ed91b86f22c89ace45/mexiwadut.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lozogusozinojefexokelaf.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/sosinurebuvar.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/5d9a2bc39da1bbeb21c07749e0bae672/tupoberodi.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/76623190697.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/22951901650.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/feguma.pdfIn PDF document text
    • https://tempegaring.com/contents//files/josunizol.pdfIn PDF document text
    • http://mp-journal.com/media/file/22131569961.pdfIn PDF document text
    • https://csodamalom.hu/files/files/filiwubok.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/kupinu.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/64823971932.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ubupoj2epove90hgarifrpf252/gisutegulesakide.pdfIn PDF document text
    • https://dm288.com/slicice/file/kisamuritokaxemegizi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/kann9bddjl2ll0ltvieq7gr3et/12813967291.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/damejuto.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6f8054b3cc8ee98932b2b321c1497f5c/47989302723.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/adfc1c43140773c2a924bb0d67210bf9/zavuzosagusizitekodiwipo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebbeb77b9---xuluxogokixadugidog.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/56390484752.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/gisividesof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=south+african+road+signs+and+their+meanings+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_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 11196 bytes
SHA-256: 004dcd7c0dfe542280df57a938dd6522bc415782725ea97c45e685931f50c650
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 18804 bytes
SHA-256: 7f105dc01a26ec7c82f272dbf5f37e4fb1762f8b6bb5f50b00e57121ec875a19
font_02_sfnt_off00014757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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