Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7799f544277a91c…

MALICIOUS

PDF

88.3 KB Created: 2021-06-24 06:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de37c740055ef77202f5898814ce6e47 SHA-1: f369bba0e5604d6efcac16113880b8311e386ded SHA-256: a7799f544277a91c5b54dc905de55ddf2e55a753ec07da36fec1bae9048533aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external links and the PDF's structure suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://btcauction.vn/hinhanh/file/18140733484.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/853209224a373f9e224038d4d5b4c142/gupisinolazozaxasozokole.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f6il5mivnnktuq95tftjbu5mq1/salusapineto.pdf
    • https://kovtec.pl/eurostyl/photos/file/moxobones.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e244d776e7.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2292a374cae73b81ac9e52b7ba0cada3/12111301954.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/htthgi7rb987kkbsqcshs64j4m/wijipe.pdf
    • https://asiarsolutions.com/userfiles/file/49290766399.pdf
    • http://engroupe.ca/aym_image/files/xiponigamexanona.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6kgbqpp0i14tp4oqgcqtphgds2/74006512779.pdf
    • http://oreade-breche.fr/userfiles/file/sevalezu.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d161c9176c---wazadatazomizaguve.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7e19b886---99257729789.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be46a86481f---64421313194.pdf
    • https://tylbm.com/Upload/ckeditor/files/62808572786.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957b01d44d4---96257224420.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a0a38909bcfa8c7eaec1b3eba87dd8bd/zijetivumesodegusafupag.pdf
    • http://petukmahaaaraj.com/userfiles/file/mezedenunobise.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=alp+cbt+2+question+paper
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012b10.bin
a55a5610631abfeeb71b1c346c8e7191195151a79dbf9d28d4d3350801cfe0bb
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B10 13252 bytes
font_00_sfnt_off0000e7aa.bin
8826da993c2d251860ec79b5a2f8004dc3e677919b204f148546c176edccafec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 5312 bytes
font_01_sfnt_off0000f9c3.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 3720 bytes
font_02_sfnt_off00010526.bin
97b3d09373e15fd8006b52c0c7b51f99a713dec487308e50e715f7c9137722fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 11168 bytes