Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d44f92570ea244…

MALICIOUS

PDF

91.5 KB Created: 2021-07-01 15:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f547950965dc74d57cd037c83a16534b SHA-1: 771d645a5162d6584b43c2a18233c6ab24b7d9a8 SHA-256: 24d44f92570ea2445c61600acbd88c5d78e26556822e9b2aaa1c42960890cc4a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded links are designed to trick users into downloading further malicious content, likely for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://alatheir.com/atheirwsfiles/file/90701100243.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8afe6f2c7---zoxupurunejebazeruv.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a82ae7a7a---80836469318.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4b90949b598978a34a5d7183797c98a0/lexusalomodibedabedatota.pdf
    • http://inlygiaylynhua.com/upload/files/zesibitudik.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106271901598040.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3bce06692---28747494918.pdf
    • http://deltastal.ru/userfiles/file/jigusobosixuruluxutexe.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/0d68637e95f10552cb85c8ed8f65afa1/remopuzaxejaxesukufuvenik.pdf
    • http://africa-emergence2019.com/userfiles/file/norurelerodirewawe.pdf
    • http://toshiba-center.ru/uploads/files/xuzuwoxudola.pdf
    • http://taxicityplus.ru/userfiles/file/mototuzibanerub.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/27014918847.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98f21e7e6---rowuvotafibekuvetevurubix.pdf
    • http://nuraski.pl/wsg/userfiles/tefojapevogevozisake.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2bd7bb436---jotumepevele.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1de370bb---gumusavusijutu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d346c91ed73---44689076130.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a2449c32---jakijidiboxef.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9a634e90---86765429165.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gisusatujuburogenino.pdf
    • http://primaneighbors.com/userimages/dinedurivigobudulofevu.pdf
    • http://malifer.hu/upload/file/nubimawimagarosapawokit.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523b8d52d0---53928368538.pdf
    • http://biurod9.pl/public/userfiles/file/levuneruxejele.pdf
    • http://yule-sign.com/upload/editor/file/20210527024740.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=staff+of+god+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16792 bytes
font_01_sfnt_off0001039e.bin
d91dc878ed72158028eca56a3f6382b5149bccd133e00e083327716a0336c678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10456 bytes
font_02_sfnt_off00011b23.bin
31820ea10f584e1e54d2c8b077d8aed737a98f278e0e905a8b6b647d5a930283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 17312 bytes
font_03_sfnt_off0001350c.bin
04150ebc99f4a245d568440d068fe9a3977a4816f306baf5ab5ea5940d31a7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 16656 bytes

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