Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb2395e9aef5408…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 01:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c86edca006af747381665692adf7d9d7 SHA-1: 5e981332d9f6542a4b46a844ea0099d81dbdfe10 SHA-256: 9bb2395e9aef540892f02f5d33e7f44f8ed586995d99a784b2c2fc761a44d459
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting further PDF files. This suggests the document is designed to lead users to malicious content through a series of redirects and compromised infrastructure. The ML classifier strongly indicated maliciousness, and the link farm heuristic confirms the suspicious nature of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b02e4aa4---22344824769.pdf In PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/96in5i4cgo2qldmv81es0dcdto/wakabimokevop.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3fb4f4f9d5e87fd9b964e57c8a0abef5/kabalivizowalakeki.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xeginosadoxipor.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c85282560d6---xiraxaxesekexog.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/suroxojewibutifexoga.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/33875067111.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gezejakilelaneradifexoti.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102db64d6dd3---ralalemepow.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/menuviterojajil.pdfIn PDF document text
    • http://secoinblock.com/upload/files/87560758116.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/tdk6ogjkcsoq2p566lsqvmqovr/kisifu.pdfIn PDF document text
    • http://tano-cable.com/d/files/72526182409.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc78cf367---kuviwoxezadikiwuzuxo.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/vomezefabepovifuxulale.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/semometojafizekuv.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/14973423697.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jk6s2pgg35r858kctn06v6iul/kasataxajufaloxo.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/72181982889.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c66d3c132---30387708437.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/zirimawitidupu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078602377f43---kelubonukokewonojibonubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=real+life+ghost+storyPDF 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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 10548 bytes
SHA-256: 6be13405f5a4cf023cf78b7b48a63c4dc8283e990ee90268d094a7486a418b76
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 18240 bytes
SHA-256: 2907ceef80a9901d75bc3512c39f6646da1972ecd75714c721de29486b1537e4

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