Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd242134e491256…

MALICIOUS

PDF

86.5 KB Created: 2021-07-15 19:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a35a8e221032813e117d0fb971f38816 SHA-1: 8340ae754920155cc8ce386e96ecf65009d8539b SHA-256: 9fd242134e49125613ba106dbcabe411db57ee318f6d319bf06e0c3c263eae8d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://telenovella-bg.com/files/guxujezuxisadok.pdf In PDF document text
    • http://orderleesushi.com/uploads/files/mufelulikavifejugapozona.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/751f94095520fa14949b65db0bc04f84/21043529065.pdfIn PDF document text
    • http://tipiland.net/upload/file/25851833730.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6ae96480---sejudisojidukodided.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7a1e15789d13ba60dfdd823dac45364c/sidovoxezoje.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/541c92dcc5207f42d65a32a3c797e110/83792150290.pdfIn PDF document text
    • http://didula.com/img/file/62190975554.pdfIn PDF document text
    • https://migger.dk/userimages/file/virinotebuwisifapusewukit.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/62759243731.pdfIn PDF document text
    • https://codecs.roimages/file/30519746265.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071821cd49f7---87162489373.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/vujuxosutirukewurek.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f2b2a905---lirulibab.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-29/20210629170808709553.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/21505638870.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/divolar.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/475365c5e10dd4ce213319f9c158c218/52574379008.pdfIn PDF document text
    • https://windsbs.biz/files/file/15279202908.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/vopap.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/21306600851.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/59990382271.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dbf5997e583e9061e307ca0c7aad6597/gijiselegulex.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34214fb33---vanisewibuterepaparokerab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=where+is+the+912+area+code+locatedPDF 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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 17484 bytes
SHA-256: af1641d9a6800e98ffb4f0d3cfd83e30335fc9482ea350fcada87532eb97aa88
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 10696 bytes
SHA-256: c5792e968c933b1cd63bf7e5e55309359cc3b8ee4b56530ca75a82813d206962
font_02_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1