Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b543b7c954c787…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 09:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ddae64f190db4d42484e0f9c5b3c9462 SHA-1: 635e5842f72c61eda40ec1217341d9470dc1e59f SHA-256: 43b543b7c954c78747db03ff124a24a49e436b3dde97d8dbb4a7f450542b2075
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites hosted on compromised WordPress installations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5dd8c858---53467339082.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4684aa2692---tewagejemifux.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2bbd22abf---padasuzojofebovebij.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d562ed3f8729a96f77a1bef9ada60b71/mikodudutadavaf.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/pizet.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/livanaru.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c4c0ddaf96133f4a7c5bdab85cd2601a/87453922065.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88da839e---67039047237.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ef121edac19e21fb74623f4da47e3ed6/43992513043.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/30675182730.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/jevofegagobekimijew.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/haavhic4uftn2c1vhqij1lk427/fotepijedajotozabo.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061118435470554.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v9ns5j0ckkg9snb51763veqpg0/75861702241.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/vajurogadewudobapetulebaf.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/fajituzavuwaketed.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/vavikolofafewajavuzodana.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb628f0cea---vijisoledirunu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e3fcfbfe---81540314882.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075958033e36---85313842456.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d3e3dd8d---nixewuzokanej.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a44095430ea---91111424619.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52d464fd0---pavivelox.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wuvibob.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4032a7ef---faxijavibuxukemofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=infection+after+tonsillectomy+childPDF 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_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 10808 bytes
SHA-256: 296dfef953d4122ba3346b1f1a6806b426c194f1f2331368f742a24a5a1c9d0e
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 17384 bytes
SHA-256: db3bfaf5a5d3e38f0d8d266fb17e6785ea30b2ec2a9cab5e23209519ee58a5c3
font_02_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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