Malicious PDF — malware analysis report

Static analysis result for SHA-256 da210487b52d2b06…

MALICIOUS

PDF

100.3 KB Created: 2021-07-01 16:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d964e2494fbe074d382ff0461920abc SHA-1: 2cceabaca7ad2b5967beff435989d27ae899c66c SHA-256: da210487b52d2b063c5eb42048b1992ba19e6bc62de868f617555f1f02be4b74
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to download and execute additional malicious payloads. The presence of multiple URLs pointing to compromised WordPress sites and link farms, combined with the 'Fake invoice / payment lure' heuristic, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://medvor.ru/uplcv?utm_term=meaning+of+nota
    • http://szao-spb.ru/images/news/file/jegaxarokozexanuxadadir.pdf
    • http://arisutour.com/ckupload/files/gedevewigupamesupedogom.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/45752144190.pdf
    • http://bawaconstructions.com/editorData/file/zuxarofuxumamibo.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/27341ac8d0135c1067640ce34ad9d7db/solosexipolesod.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c9b9bee7e0d042900006f5507d23ff01/tabojagukifapunuguxiwogi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a598adaccf9---55517614817.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/41869dbff0bd2111819300ea91e1c8cd/70356325066.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e7bd915b---nolimoxawuladibe.pdf
    • http://agcslohian.com/userfiles/file/guvakamowewuri.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ab2ba921f302f809dcd173e0738505d/70407528028.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/057fa86e43e646bf0ae8ec3c800ea71c/sukitozoluwo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e50de0941---43670186718.pdf
    • http://yjsyrj.com/userfiles/file/20646380659.pdf
    • http://akicgiyim.com/userfiles/file/62563770.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/budaguvukurizetakatox.pdf
    • http://hrt-foto.hu/_user/file/fedanuxo.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0cb102e5223b278ebb49e79feafe3a71/62312982943.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31a90c7f5---jeredojesizutu.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160933ebde701c---rufunavamifel.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89a1407f2---94491171313.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940a1e195f2---refinimuzarire.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae6b0580b---43893642238.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/47453177288.pdf
    • http://rajskiewakacje.pl/userfiles/file/wanofetumerarixafam.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014f0a.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F0A 18328 bytes
font_00_sfnt_off0000efa4.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 3464 bytes
font_01_sfnt_off0000fd1f.bin
69559c699fd9e54489401b2e7e3ee4e7add8d5d17b0fc8e951a14e041e52733d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 23724 bytes
font_02_sfnt_off000136f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 16792 bytes
font_04_sfnt_off00016cac.bin
d4de46a945f5e2a1f357b8c6e96213b985444d5c21569eb23bc11148613d72d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAC 10068 bytes

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