Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3ed5fd8a43e964…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 17:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7838457d323b860d493e7cb1f539a2d2 SHA-1: 06e7403c677f5ceae896559b3963ea9883f179e6 SHA-256: 4b3ed5fd8a43e964e80462fc4709f3bfd0947501bc765dfab4531df52c44ba5a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage. The ML classifier strongly indicates maliciousness. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://atomicattack.com/atomic/fckimages/file/24578811312.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/pasekete.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/fasoxubuvupirefixijix.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa50bc89---zigiluse.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/ludaxamimebu.pdfIn PDF document text
    • http://landia-print.com/pdir/file/15517958962.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/77393995262.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/ganidowuzanijizase.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/katoki.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383fb16befa---xuresuru.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/kujudupevunogosomakudo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/58713096223.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/33247464548.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/46207665161.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb641ed28d---subaweritegadixe.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/73498844919.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/rejakexe.pdfIn PDF document text
    • http://classtool.info/upload/files/53063372179.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb46007a0---22256145636.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b1fcmo34ccon1drcufap8pksl9/49368787510.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/jadutatubekirapabis.pdfIn PDF document text
    • http://kes.org/upload/editor/files/bizaxefewinane.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984fbb76e3---60391616343.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/renudunuvodubi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/66017866082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coc+cloud+botPDF 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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 16516 bytes
SHA-256: 5633e606d95a2b2931bcfb33d987a65ae33b983929e67559f37b9c0f9cd7b6b4
font_02_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 9876 bytes
SHA-256: ce1273dbdcbec0b8ea47b6bbdbf33d639322025a23eb787d3ed702fe71c0df35

Open this report in the interactive analyzer, or submit your own file for analysis.