Malicious PDF — malware analysis report

Static analysis result for SHA-256 987e1a6df6bfdc57…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 07:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5b02f5a32d192560080a7d6f47c8a125 SHA-1: 585afb4cc3028a42a4335741d141359ad25fa14c SHA-256: 987e1a6df6bfdc57ef063b8727a6f1a8d21ac7cd10419d6357cececb1519737b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature. The embedded URLs are likely part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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 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://archi1919.com/smlclub-files/file/lurokeje.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/02c05b38485f927986ba30b043e41f31/98879549882.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d406e3099f---89154117061.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/35721872986.pdfIn PDF document text
    • http://computerdoki.hu/user/file/83963600352.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c2b8b888ee07deac607cbf16b187d6c5/62352326391.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kexigop.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad81e40dab1---22243272676.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5ba6985c67e1faeac6e2eb71efd6e8d8/rorelipo.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/jogawumajawad.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ffrp8tbb5uarlskkvfa45q2lta/23617576207.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • https://curvy.tw/upload/files/65853163061.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/pufukuzujakamuzotosife.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160827ed8c3b77---tivafarez.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c79130111---fegutudexusopitivebon.pdfIn PDF document text
    • https://lesura.net/userfiles/file/52743843671.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/75ansdh4i0jmpju1fod5hs8o0t/47062287960.pdfIn PDF document text
    • https://maturana.cl/upload/file/21467782371.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210530_013657.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb62230a14---viwexu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1391dabcb13abf04847e4bd9ae7ebc99/63045144571.pdfIn PDF document text
    • http://billsky.ee/files/file/23029798989.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/109a61c8b08c1fe20f96600c576ee5f0/76644434407.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53b977aaa---sixefafutemi.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/fusurarebewateg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=charter+school+cary+ncPDF 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_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 10380 bytes
SHA-256: ebb5b07f3ce345c30f1a66da876f94672dd8656c80953bf668fa7da1f4fbb629
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 17188 bytes
SHA-256: 74b54f1d8870e1c5bd18d4770a54a8fa16a53282ed3d4c61b77219a35a403966