Malicious PDF — malware analysis report

Static analysis result for SHA-256 366cbad6bc0abe65…

MALICIOUS

PDF

91.7 KB Created: 2021-06-29 10:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87f9a1a53e939ec4f27fe1a57ef9cf3a SHA-1: afbbd34eb3136529d03a3dfb4f3bb32a8c78b8c7 SHA-256: 366cbad6bc0abe65afccd1db1b2f8a93cd05e64f436573f61f9a1a4b3f6bf70a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or credential harvesting campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for distributing malicious content or redirecting users. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://poolpoint.be/uploads/file/76007613582.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/934otpdh8ji8j4ka95jtkk17he/sivuzivodafomirimino.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/70017723917.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/fulimi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/26747443132.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/86711193096.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085750fd7644---75862931969.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/36332182162.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c782033a6---69064830007.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17578428887.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fa8df9ba---jagezelore.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1274fc2e---95207843875.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/cb3a4c5334a816b20f2b0e71048107ea/60840787451.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/582dcb695604d21d5fe2f3ff8b98371a/22240858741.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/2655087553.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/laterexutigopesemawebokiv.pdfIn PDF document text
    • https://actorconseil.com/files/file/71484125092.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae064815b---95370153052.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qkhdfsi6i2j6peeatpa6dc8jf6/jasajotejijudotasegetafi.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/dedivonokig1623661825.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/43h0l4i3dj1rfpngf5j9fdo8bh/18263620546.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c34de7e8---92022610158.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/fukexituruzi.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c7127faa45512922973928f20ed78c68/waxabovogimoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+outsiders+greasers+vs+socsPDF 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_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 17248 bytes
SHA-256: 260acb03666007e4cf3cf45ec7c820f62cf474f5cb03a7f30a12c58d8f894e30
font_02_sfnt_off00014942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 10628 bytes
SHA-256: eee91f41943c44cc09c230fb093dd60157300408b1daddd3b21c1c046e3105c9

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