Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9e21bc5e52d2b3…

MALICIOUS

PDF

79.7 KB Created: 2021-07-01 16:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b1d54ae563aa7684d2f11db238396e5 SHA-1: 73eeb3651cc1abc8e95e0cd3460ca6154ecc798f SHA-256: 5d9e21bc5e52d2b34a4ebdeff66bd8006850ce4bc65f7581879c01683dcb67eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ncabhsa.com/clients/875427/File/15628748076.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a327d5bc---40694977020.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/qp58s52178bka6mm206l9vrdlf/7544517901.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160968a3f43492---14054789520.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/bipomonemexefu.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/8b85403ca2ed7bd154dbfd9d5003d16e/65522130277.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/34943342112.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/zepisiwowabajomu.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/o0iopg5iuuf4217endkjmv1dcr/fosirurupupole.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/bufufu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/52ae807179b8cbb271a4661c8e264b33/raxeletaduvu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/10063549777.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fuwigawowek.pdfIn PDF document text
    • https://autopratichesas.it/file/rumaritezaxof.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160706b7d09483---17598691821.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/59993792453.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608542ccde0e9---3175722142.pdfIn PDF document text
    • http://honda-vo.com/upload/file/baxomaf.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d58aa67a---61620727310.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm69reuve6g75rrnc9pje3hl5c/koroje.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b510a00f914---91723469064.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609565aa234f7---10988551378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=countries+beginning+with+wPDF 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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 10536 bytes
SHA-256: dbad82a0d6a417fa40da64f35d593accfe69ca9007f1824d9635089572dd2c6c
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 17396 bytes
SHA-256: 9e6f9cf96f57597bb6722015c26e69355a63ff3cb45dbe8361b24c408aa15528
font_02_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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