Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b160473c756f45…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 03:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c95cc3406b67a6f33e45992ba7247d92 SHA-1: 5de3c72e1cc8d2742a3658d20fd06874e78a0541 SHA-256: 88b160473c756f45b21a297d593d9beb9f968630c98eab45ac77e944d2665a27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to link farms hosted on potentially compromised or disposable domains. The presence of JavaScript suggests an attempt to execute code within the PDF viewer, likely to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=pokemon+gold+gba+cheats PDF link annotation
    • http://telecycling.org/files/file/vedufokavugus.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/lijefefa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ebb0e9f6---83450284709.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/71884097916.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/23435631055.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/tubelitebofod.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/mevufuxiwatofenakutavo.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/60473390362.pdfIn PDF document text
    • https://plasy.com/uploads/file/60464966725.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/37614982628.pdfIn PDF document text
    • http://schokozentrale.de/idata/60030654787.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/80874226751.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/13191891266.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/94786745460.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/41009038164.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/wibizovitapazuwelikakevi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nobovokatebo.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/fesinugizumokizidukarijan.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/doxovabe.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/23857870775.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613398dbea4db---83659664964.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/46162344747.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tafodosiwiteliso.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_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 17456 bytes
SHA-256: ce15da50f9369c8b99793548af32e568969f76ccc61e37c8848969869d4ca3d7
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 10856 bytes
SHA-256: b6aeed567e621651cfc10f2f8b1827b935eb3afb5d515cf0260584df27c8dfe3

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