Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe24c3518225105b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-24 07:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a6d81fb34aab221538c67eb37c7b0ee SHA-1: f546b42648610e6f1677c970950a3e9abdc2218f SHA-256: fe24c3518225105b364f94ba3fbf728ebd32de5dadd6ebcb1ade5883977d09b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xuanhongkhang.com/upload/files/wuwuxuwolovom.pdf In PDF document text
    • http://kaies.net/upfiles/210908074205056619m3xirx.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109080333391489.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/boxinobesuluxujukaguruj.pdfIn PDF document text
    • http://agenturamotivace.cz/uploadfiles/file/33070973240.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/pexuzigavuwiferipexetox.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tamunuses.pdfIn PDF document text
    • http://gwynnoak.abwingsmd.com/uploads/files/zozizebe.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/fedumirifepatiluxubulo.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903145819.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/14334604372.pdfIn PDF document text
    • http://swhos.com/upload/files/60854734588.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/tarafawijebejupofus.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/39883114815.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091207043270554.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/43969268578.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134beb85c9f4---fivufutonixowukuwimifo.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/zoxekovib.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/dd4c18e04bc9cdf4d5cf55f1b097eed0/70423286765.pdfIn PDF document text
    • https://paperland.bg/uploads/file/gokezowixebubataw.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/wasagebag.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/084c127c06fdc2e3b266493636476a12/23589494056.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/52906995097.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1275aff5b1f9b3baa2697930f63a743f/18076738187.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/5040504854.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/86515410846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+camera+dslr+camera+professional+apk+crackedPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10868 bytes
SHA-256: 945915132cb1dfd4077653d2c2502f64a96c89a8ee19966e6dcd24bbe9df2a99
font_02_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 17620 bytes
SHA-256: 9fecda7636a3f32fb361e35ed4c808baba10342c78f76676354d5dccb4e8824c

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