Malicious PDF — malware analysis report

Static analysis result for SHA-256 188d37b7bd650cad…

MALICIOUS

PDF

86.3 KB Created: 2021-09-10 07:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7dd856ece44dfcc4474e3fe01d7464a SHA-1: 00fc413e144bea3013684a0ab0a208c8439d1ecc SHA-256: 188d37b7bd650cad5197760b0abaa7ed8cfef1ff87465046cd812de65ec67ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=fall+in+love+with+zombie+full+movie PDF link annotation
    • https://horacebatten.com/ckfinder/userfiles/files/netimigesomivevo.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/39604113796.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/fedunesoguwemogolerimad.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/78665660390.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aee816b18---zolowerejekumajazu.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/vunar.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135c484c04a8---49653586626.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/fefakaloxux.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/patitikositagusezeb.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/623665046.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ee78df1de29372923b9509ab901a2434/towetupurutawezade.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/livowatesap.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/gunisudajuged.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/guruwitepegalowobumabe.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/bebuneveworexoturonu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46755a641---vavur.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/ziperepekivezape.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/pajufosebamiletupasibe.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8836d17f64624e2004b07fa4b562da7b/32161705353.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/65357066742.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/70637082965.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631029027.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/tuxotikoxikigofa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10640 bytes
SHA-256: 2e1095eb7a671135fc4f60cc743e4038b62791a57f2d28b37f71b2e9bd01f7b1
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 17632 bytes
SHA-256: 144bd66433cbe367b7f92bb296bcca83b659192e975a9094d0780ba4960c30d1
font_02_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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