Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a17e5bac8fe3fd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 09:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 717d454141430a87a182e97828414cfb SHA-1: edeab26217ce1e2a9f9d588225cc4360df5ab681 SHA-256: 27a17e5bac8fe3fd5536426f83ee47a14a1ab248d3953d412e47c5dfb838f2f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=how+to+change+download+location+in+play+store+to+sd+card PDF link annotation
    • http://leicesterbiketec.com/userfiles/file/wobakomudi.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/35468214736.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39b22c9ef---bilagogir.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d7c215decbcc14570ca02082bc6e5b4e/28710676576.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/wobew.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/86470240033.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-16/20210916001822974086.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/76465267644.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/428ede99aaf961179abec03660180dba/96366097334.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/jofepogixulifi.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/mivurenagukabegumure.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/gejom.pdfIn PDF document text
    • http://synowka.pl/galeria/file/befojifakelusupaludajata.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/bevodexubotepotipeb.pdfIn PDF document text
    • http://ud2-140.com/files/33635074447.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/30255737623.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d2e8e92a0dcd5cb5e82dd1f624b9374e/71212140958.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/83336149034.pdfIn PDF document text
    • http://clerus.hu/files/file/35112972763.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/juvapevigavimi.pdfIn PDF document text
    • http://amdind.com/userfiles/file/30828989974.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/malafanipibakimunuxoba.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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17896 bytes
SHA-256: 529f134cc34c79b75fbe8fbf5eacc3077cf5f50ab1a107050d3890571a82e2c2
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 10984 bytes
SHA-256: 81e0282819b18f7791cd0121e820b59bfca0e8d6403d1e37c82b0fb5be1aad70