Malicious PDF — malware analysis report

Static analysis result for SHA-256 39927188c5315dcb…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 20:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c871c1ffa2e544c8c7763f3a431bcf8f SHA-1: 464b647745dcf4c5c247bfd7f56d0d9205ae064e SHA-256: 39927188c5315dcbf468fe60a0d0c273cfd803bd0684ca1e8138df3918eb7ac7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm and a lure to execute commands via copy-pasting into a shell, suggesting it's designed to trick users into downloading and running further malware. The presence of multiple URLs hosted on compromised WordPress sites and disposable domains further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • 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://garglob.ru/uplcv?utm_term=windows+xp+activation+bypass+2020
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfce253755---3397913904.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d92a19fac---25163887472.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7c79f12d---fivefoduxudu.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/nn14hm3qpoavg7g56596gn9pkn/sutopiripot.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160801608242fc---pubijituv.pdf
    • http://scheidenschiedam.nl/uploads//file/zuzama.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb74e58f599---92170491943.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/40546126043.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e752803e2---10425142184.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/31710419574.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qenc6v6ktlpol8lp9e3777rlrj/98424698077.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/373cdacbdf32e44345c065b587d990e2/16331646607.pdf
    • http://yuhongzg.com/d/files/divatitupekemerob.pdf
    • http://jjinline.org/file_upload/file/sakuzeduk.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ee49a12dfdade065ad1d03792356d02a/73461579739.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbba408c0---xedutajapuda.pdf
    • http://iglozawiercie.pl/zdjecia/file/gizozebenojexodeloxameki.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5q0rhjndi8oq93tgf6i1qq16m5/tuzok.pdf
    • https://nestaerospace.com/uploads/file/18319673985.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/jedotidelemaderoterizag.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8c37f69d4a84b2691ad4844f1ab21ed4/zelabopitajelunilukokep.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160982f83c462c---tonopukisulozu.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u61a44jmnuv6bcdn8pf7hbeajn/16054531862.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/skr3a1k6s0618vp5ratoru7nce/miwudabaxaxaba.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7ccd9e8113f03571aa5002a8ca49ea8f/gefetanurekepegesemotarol.pdf
    • 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_off0000eb9f.bin
73b5de79f0883b40165f5eeb1df2622a43445dc5c8b832f2390545cd637fc820		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 19420 bytes
font_01_sfnt_off00011d5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16792 bytes
font_02_sfnt_off00013576.bin
a9b47a33c649b0f297bd7ec888729de381f8505991a572c76cad9028870fb515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13576 10972 bytes

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