Malicious PDF — malware analysis report

Static analysis result for SHA-256 b959c372a8ee5bce…

MALICIOUS

PDF

133.8 KB Created: 2021-09-02 20:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80d6097ec8c45028cfc9ca1bf4428ee5 SHA-1: 14ea288ac8c6214166bec4f4966f58ae8d04b320 SHA-256: b959c372a8ee5bcedfa3a95508f07b274278d6278f74ce737bf68fbc3a604d93
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous external URIs and links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://catamma.ru/uplcv?utm_term=asheville+nc+map+pdf PDF link annotation
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/9k5k3f0lvrm9c1tvkm25ism5da/45181352685.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d1395b0ba7a6814046a23c0900ef9357/wujetibo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/fegavagivekuw.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/38914936248.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/sisedagekozopojufibotok.pdfIn PDF document text
    • http://springbook.no/files/65983105000.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/77053802373.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d5ded5854---ganuxibak.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/23517835490.pdfIn PDF document text
    • https://bonacorsi.it/file/41040643869.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076751792432---piwanesebilusab.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/dexabekixuxakowi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16129ba54d428e---zeriwebaladarulisos.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/cvk25vfq3ue0nlqfr9k5urcemc/55930665623.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/o3n30lb420dooa0fqpp8u4p4o7/61206648419.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c356affd2544b18714df0bd8aa5b2013/91522469970.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf08b4763c---96592019662.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae528639d---96415529358.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/8688942982.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161198178c7fb8---94956105185.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cacf2e24005064fb408df9f6e9e92822/86067010766.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/rusetuka.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wibafetiwas.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c968dbd70aa---25514319365.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093db648d29a---63626557792.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_off0001a289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A289 10616 bytes
SHA-256: a5bbb8328635662e64262a6f74e29d683bb65d3125b1fe2ec9009436987d02c8
font_01_sfnt_off0001ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA9C 20412 bytes
SHA-256: 95c3eb94cb0b726fce76dd9e376bf478ab8255b8c37d22ba3cd1ad0d385b13ed
font_02_sfnt_off0001f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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