Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b12c6d8dfefd6a…

MALICIOUS

PDF

91.3 KB Created: 2021-09-07 20:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e79f946cfa096a4ee8a14ab9b06ba50f SHA-1: b2b2e75cb03dceb45eca3dfb82eb7d831e50037e SHA-256: 37b12c6d8dfefd6aed243e069f62d9ba4c3a6d7d6f2d895d6836e72f76898bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=hoy+estaras+conmigo+en+el+paraiso+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad5fb5ced---7258302957.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/xosewijujexebalujodopel.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/meguporajewiwugozemisun.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kofuguzepufujelokeb.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f904d9f66c---63920479431.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161041fd0d7121---21386462569.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/233364d90c0d2e6aa3004f51aedd904f/28787502117.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/979754c9f5d763e38b5f5a1df42f19ed/39239245739.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xukejutolulukalepe.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/vikawitati.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/dotuzonojonomaziwakujaxar.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/058becb13bf060b6941e737c6384824b/xadujaximipebebe.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/mudowumumefowewajazanadov.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/56377815931.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/444c3bb280e003b67f5b29de82190b0b/88288192118.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096444d1e860---rasuwagarutipizimiguv.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/52781419482.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tlct828hc011v5kk8d4mb7is8b/lokafolanoguzud.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1ip6fb5h1seho9colbdisl40p0/19591582431.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/72658667349.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efca6ecb2a---vamibitoladopowa.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/xipemogu.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_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 18984 bytes
SHA-256: dc4314f6d4421da96da9ee4e21b7739e99e1c19c5d0011b8753ecff2cb7c4e48
font_01_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E4 11068 bytes
SHA-256: 17c52359c8503a0d042cd2890417dca57d54c9518f612fbd5ac5ced106645111

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