Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1658972bcae7697…

MALICIOUS

PDF

126.8 KB Created: 2021-08-02 11:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99f9bea957e1e884deda7f52b7eba48d SHA-1: 4816f67190a7103cf226c69f3a252846562f1f1d SHA-256: c1658972bcae769748c3b90b37301035e61c20dbca06bad05d0cf94556ff4c36
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • 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://fisheaglesafaris.net/pics/user/file/10370518316.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16095a957296f4---66309618316.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/natujukikule.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/56446703759.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bejivitozerukenuku.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uk542491rlhabl1mtovfltngau/31354674274.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/532023ffdcafeb9e70bbba1c7c69bb4d/tewexovopogafomexe.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3ee9ca32e87444eb57c1393a42180b55/79966518652.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/gelowaxiva.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/71843417353.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pa598am6ap8t2d0f7lv8hvqned/15796813831.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sodawasivexibuwobono.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/rejirumunijo.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/muzopewu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cd162ef862d3b1a5c6551920f7357cd8/66946864339.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/88165031967.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9223068807ddce18890948826227ae1a/57290763310.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c548633e3b8---taruj.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a9fb117bpk09hv34eko8943dau/31300473119.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/vobuzinub.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bopedimudadipel.pdfIn PDF document text
    • https://777mto.com/contents//files/22573049639.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b15fef01d67---sisakuw.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb6f24098---verodanupumosugirujivoti.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/fagivafedijokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=circuito+amplificador+de+corriente+con+transistoresPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB0 10912 bytes
SHA-256: e54463a7dba034f83309da0af5ad98910197dce86ea81873d317e22fc2999db4
font_01_sfnt_off000186f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F4 20376 bytes
SHA-256: cd835de8be30e5a9155bf36addfc0b20e5441beb2a1d5c71416803d53ca6a25f
font_02_sfnt_off0001bc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC52 16372 bytes
SHA-256: b01d7572b4e959ded3d053c971dcfe982342cf7ac0f04b5360be5fb93e61da75
font_03_sfnt_off0001d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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