Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fc8b25eaf160ec…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 11:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d6be770d45d8dc6b4a8eb19bef227c3 SHA-1: 435c0b3ec2b7c5634691f027d0bb59fa8388aa3e SHA-256: 65fc8b25eaf160ecf862036ba7522612cae48fdba40ba8023b2dc13936fddebc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, with multiple embedded links pointing to potentially compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site or download a secondary payload. No scripts were extracted, but the structure and URL farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614317adb8eeb---73652620121.pdf In PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/50003105883.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/95043319402.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/65413200238.pdfIn PDF document text
    • http://sb-78.ru/files/file/66382592249.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/kopujafizune.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/jegodake.pdfIn PDF document text
    • https://promise-land.com/upload/file/62710908160.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/pazezemuke.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3b28bd9c2eeab2d46080650ceb1a7773/69012212809.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/bolodiligarefo.pdfIn PDF document text
    • http://ranchobg.com/img/file/lufoxafolixirez.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f2058397b95f7dcd3d2ed766370f1bbd/xametuwo.pdfIn PDF document text
    • https://qkon.ca/images/file/digigudoxa.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/65060326388.pdfIn PDF document text
    • http://agavietnam.com/img/files/77794478752.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/zoxop.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/98859442501.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/41486840864.pdfIn PDF document text
    • http://konberdbio.com/upload/files/lebajefuvetu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5ccbb58d---kimemolaj.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109241832166845.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614995fb6120d---6530702098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=transfer+photos+from+ipad+to+pc+without+itunesPDF 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_off0000b168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 14068 bytes
SHA-256: 2b1434c9ee7de3ff403bdc9b2e75c23cde39c3963ce846a1c979f00384c7fee7
font_01_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 10988 bytes
SHA-256: afb96e2fbbb15b81276a06476cd12db99e3c63cee56599d1b4caced103e575a9
font_02_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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