Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2d27572e2fad82…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 05:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27c1fd624537d5db08b37e7f264fc18f SHA-1: d40e93e5404ae5566badb886a4424d104e1aa502 SHA-256: dd2d27572e2fad822cb814b72a419a21f4ffc47651315715862417cc4527b502
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://htcpost.vn/vietpost.vn/img_content/file/jumoguwepired.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd81e2e69---33941481765.pdfIn PDF document text
    • http://pasted-radio.de/web/files/92096034809.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/18935752432.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/05049fc35ddf15e35b289403b7f0c50a/tiwojumagovafuzukixo.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/20544836203.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/jiwofimawelaba.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/41845714557.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/77326362058.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/78496300292.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/59013501.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1ccf24ce6070600fd0236e311461e09c/44522979286.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/zokebepaj.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/10199645147.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632329210.pdfIn PDF document text
    • https://kimcert.org/E/file/matimapawebi.pdfIn PDF document text
    • http://profstil.az/userfiles/file/bofozulonure.pdfIn PDF document text
    • http://change4best.ru/upload/file/96329021771.pdfIn PDF document text
    • https://iwistw.com/upload/files/15496242388.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/25542353106.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/gimubolijuvijije.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/lujadurafigijisofexanokej.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210919164818.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/duguwusaguruzibuzisitofil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=youtube+video+for+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_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 10420 bytes
SHA-256: 015d5d110260bda417147eb550b57a61b84a7bc42afb22fa0a5ff1b5d04486e4
font_01_sfnt_off0000cbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 15596 bytes
SHA-256: 7a6d1767897a0a4760473a90612287671d282cf13f28a04b678091c4f7948986
font_02_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1