Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff55228b07a25c89…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 21:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fcea7a40824c0e273e460749a457331 SHA-1: 6169f9eae5ce66560ab27fc19dd32fa0e2f9f976 SHA-256: ff55228b07a25c8944b072bf787a376030f8316217f75778911e0cdddab3680d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=mi+tv+mirror+cast+app PDF link annotation
    • http://tourister.kr/userfiles/file/72439764344.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/doregutilax.pdfIn PDF document text
    • https://e-room.co/userfiles/file/vavanakepijagod.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/89550905495.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146029d1b6c2---kibigagafote.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/pizuvivejegife.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fc2036017893b09a8d1fbe84d47735d8/91342423045.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/kekekej.pdfIn PDF document text
    • https://gulamanis.com/contents/files/riwawiwojij.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/woposajapasemivuniluj.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/93994752922.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132030e07d7f---jezosijupu.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/44140402014.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/divevepub.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/25e19d09295a770cee266dd87b447c30/wutagawukurukavo.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/nutegajudutefabiranelupu.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/78084170090.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/35286194557.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/fefugez.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/dudozuvofe.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5e5a348843a358cef097f8d859435cf9/fuxojusizi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/72524999359.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/6768183238.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_off0000bbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 17028 bytes
SHA-256: 3e430a1f50d02f6711e99094984ae74c157514fd4f698dde780a82f2ec0481d0
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 10312 bytes
SHA-256: e711bf9995fa5a14af6928c573ffbb42afde84b85df709f12e5a6bee036d6f8b

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