Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f384deaf741a5b…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 22:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f52e8880c3c0fec9129cfc6d1164ed5 SHA-1: 9d12db99d3fea33394552d96c9c2c22579b196b7 SHA-256: a4f384deaf741a5beb7a47662e2ff295cd99de6144ebf64de9eec98a8cf7e9f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of threat. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' suggests the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://adamlegal.com/userfiles/file/67635182048.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d18d6c12d08c01a2d89c16ecf436d30/74930315709.pdf
    • http://edu-family72.ru/content/images/uploads/file/49005044324.pdf
    • http://muzeumostrowiec.pl/obrazy/file/tidatibigizuvijoto.pdf
    • http://bjbtrh.com/files/pic/file/jeserubixuwan.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a65c280ae---naletotupazusavubatarobij.pdf
    • http://x-site.by/upload/editor/files/vusebabidomifum.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe8ee4e636---29165473386.pdf
    • https://combrooncom.com/contents//files/59587598251.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/7af3a46747613adf0f5fd6ad6a554cba/70225548356.pdf
    • https://moto-trend.cz/public/files/fck/file/50036017526.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa4e5d10c---45660024230.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/70d4cd1494dbb4f3583909144d571db3/42551723281.pdf
    • http://tort-art.ru/userfiles/file/57683384978.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16ee127d6---58387857514.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5265e918fd---xilatefobiloximili.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/07116d42c8164fc27c09385f16a14c50/worolixavuravilebupil.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f9432597668583b6626e2fe18b855e28/sifokavuxarorimigaposa.pdf
    • https://btcauction.vn/hinhanh/file/bevaterijafeji.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160948122dcb3d---8561534335.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607164076acef---neropamovexapilisukesalef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=arc+text+in+powerpoint
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e625.bin
56e31f358596f8b8cc4ab926b8963e47d9f7256fe44714eb8c502d6c74ce1b3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 17280 bytes
font_01_sfnt_off0001135c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 16792 bytes
font_02_sfnt_off00012b73.bin
ecdb679035c09d86e6ecaa66639626e4603f48caf4ec3c738546d1338c6afd58
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 10160 bytes