Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2220570b10c3179…

MALICIOUS

PDF

89.9 KB Created: 2021-08-04 19:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4378ac8ae9f1d6ca0d8fc4aaab6e655c SHA-1: 68f41825e569101bffc6dcf9a7c05df623ac1cbe SHA-256: b2220570b10c3179d4ff677ec00a0a6b2434deca64aac58424cb1c7a7de02131
204 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to download further malware. The presence of a 'remote-support tool lure' and a 'download button' suggests a social engineering tactic to trick users into installing potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/32766312752.pdf In PDF document text
    • https://loctra.net/userfiles/file/zexemeliwifu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ndda7iiqqmf010qt5j4pfea0o1/rekenudeni.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vevimunopi.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/64480507111.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608b482d1eec1---63887141308.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160755e20a68d0---dubugekopetariwukirem.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099eae3cfa4f---64776274070.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a0cd8b91dc759afc0de68f241ed4658c/ninemojopu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/78934084910.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/ronanupi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607288583f6ae---lizevibitolinixil.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a276b1fc9d5d5b4986f2a9852cd46bf8/1952135464.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ee8b454bc1fb2a359d9b1b26beb535c1/22997276820.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7ef227ecb7e078e2bdf2d5101967b92e/ribafugotikopepaviva.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a77d2d5d6e---43872624218.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f8ef59d1894a7d043568aa257c0bd837/tutezitufepuxubefobe.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/8229420151.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf481cd59---vegumusujurulupomito.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe3bb9e55---94335460531.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/11031114254.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/muruxobu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/1e9b14b62a69a000b2c881530c505119/55594724842.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/nomedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sony+vegas+pro+13+download+32+bit+windows+7PDF 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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 11440 bytes
SHA-256: 29edbfb96b174ceb11ecdadff17a0d4e7fdbad20dad1f4e9d4423f4c5744e3f6
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 19632 bytes
SHA-256: d7f3be3e61d7faf0b9f9aa69ab7a054472288dd9c93ea8463089523a332158a7
font_02_sfnt_off00013e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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