Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaed441aeb3d8014…

MALICIOUS

PDF

74.2 KB Created: 2021-07-13 00:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 30d4f7276b608c05501d32625505517d SHA-1: 6d03fa60b8b23f31caca417846d71cf9f3b1a8e0 SHA-256: aaed441aeb3d80147abb67f632fe813fa16e075941cdcccbc4e98ac6fe99ceee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=transformations+worksheet+answers PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5db7375e9---3445293263.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ced62a3ea---23584073012.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/82182886994.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/28343304111.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7a6beaa6---13744014036.pdfIn PDF document text
    • https://baongochoa.com/upload/file/87133439866.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jugekatefenuvolomodonabo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/23660500538.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f008e86539---82150075685.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/sijiwewitodaj.pdfIn PDF document text
    • https://carlojans.com/cms/file/89928855812.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/ribuxarikapudipupikuxuz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5150e176224e91d1ea9aa7faa7d854e1/59734595676.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/89349232627.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e13220d9d---dofefob.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/fisogolikobonamis.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e401bad517---gusivizaximadasawik.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d7f15be8cfbbd67657db6fb3a0752f8c/58594103482.pdfIn PDF document text
    • https://nevisnews.com/userfiles/82648799050.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607821c89a997---vinizadikasoluzujuletun.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cc750dab---70902995448.pdfIn PDF document text
    • 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_off0000c0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BD 10576 bytes
SHA-256: 8478ddf4502c01adf308de58dc3f56951c2bcc7e967b4725ac79aec4c66b80fc
font_01_sfnt_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 16540 bytes
SHA-256: b9d5847737d0069cea76c0033d29a404a6a62925125f70efe6100db595f9294c
font_02_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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