Malicious PDF — malware analysis report

Static analysis result for SHA-256 e463eff591e18b9a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 19:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4626150b4e96d8365fe0664d3230a53 SHA-1: a5ad96d7ef96cbfb075cebaae59ab1286e1bf8dc SHA-256: e463eff591e18b9a1be139ff494b1dbf1fedc6389a8aec284903eb4b12ab29af
224 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document employs urgency and recovery secret lures, attempting to trick users into downloading further malicious content from compromised CMS upload links. The presence of numerous links to potentially compromised websites and the nature of the lures strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://latexindia.com/userfiles/file/bavapep.pdf
    • https://rimsball.com/ckfinder/userfiles/files/4328286300.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c24fc6136---xanijezololiru.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/58376418924.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6d14a22bb1f97b336b9aa1294c9911c4/20952903495.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608690e35d876---59231140486.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ni6vdhvhuc0n5imov7j70uuudm/3057345072.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53bec34fe---wafizulonowexoz.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f15aad1e54be7aabc34bc3981930af9e/kelaforugoliworewonupop.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/47955720f132c71b659fdf257040b3ab/lefobize.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/88cee47f54869d66564b3814c69e2b18/mepabiporajuvenu.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3e97a44785ef72bf51a5f459db0ef4ba/dosokumimoz.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8dda69d2531cc8e8440595d0d08b19a7/1182827625.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb3199950---nilonulirosa.pdf
    • http://www.tokyomagic.jp/images/library/File/94716823887.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd1c2ef33b---48589807750.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/dbejalechhh68a5fenm3240ki8/zilidamarasufizedemu.pdf
    • http://hnc2.com/userfiles/file/pibixagisepow.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/64677856185.pdf
    • http://mtsskzy.com/userfiles/file/zasepidajezaso.pdf
    • http://bagiez.com/userfiles/file/bodijonowexamewivodoz.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2072053d---70263594214.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=verify+identity+for+unemployment
    • 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_off0000eb3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16792 bytes
font_01_sfnt_off00010356.bin
8dff0e1f2465da7a19dbf41b4992426713f55be1b4c11e3d49db399037249c7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 10512 bytes
font_02_sfnt_off00011b30.bin
7971044efa221fe7f65530558e4463fb7302ff3b4b26e2bc8fc255c8e18663f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 17104 bytes