Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae7e3e1c642d9cc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 09:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e0e7abf109530165afd203870345864 SHA-1: 1c5ee4f355c6cae2fb46f171ef4209f971dd697f SHA-256: cae7e3e1c642d9cc6a6df3d8251efa4cb38d209bfba3b791d9a27d7cca1c0f78
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://american-security-inc.com/assets/ckfinder/userfiles/files/wesaforu.pdf In PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/melowiseridexupomelazodo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613482110385a---67432814254.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/lobilawesapegubugojerimom.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/46676764140.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/veludetagawirorigus.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/67355299123.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/5638394408.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/kebuzun.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091103341214.pdfIn PDF document text
    • http://sireny.net/share/files/gagasilotaxufemumaro.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/61520519790.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/fibixivujuwokuj.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbd8e68c49---43553798510.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/27428340868.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lowexovizujatof.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/jemulabavu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f68b432e5---vipupigina.pdfIn PDF document text
    • http://zenithmetals.com/files/xofuweje.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210911_8553650AB4D07F6C.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/63725227447.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/5938543881.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d32f32a6---gasenubite.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/fudeziju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=turn+off+facebook+notifications+on+androidPDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 10716 bytes
SHA-256: 92c07f5fefbeb396c11547489e5a101ff6f4219488487018749d112260ff6ae4
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 17384 bytes
SHA-256: 7893e89baf2446106efb07b30bbb6ff760498f373f861e97359ac090af2c9208
font_02_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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